diff --git a/devel/ccsd_gpu/ccsd_space_orb_sub.irp.f b/devel/ccsd_gpu/ccsd_space_orb_sub.irp.f
index 3d5969f..6baf904 100644
--- a/devel/ccsd_gpu/ccsd_space_orb_sub.irp.f
+++ b/devel/ccsd_gpu/ccsd_space_orb_sub.irp.f
@@ -120,7 +120,7 @@ subroutine run_ccsd_space_orb
   gpu_data = gpu_init(nO, nV, cholesky_mo_num, &
       cc_space_v_oo_chol, cc_space_v_ov_chol, cc_space_v_vo_chol, cc_space_v_vv_chol, &
       cc_space_v_oooo, cc_space_v_vooo, cc_space_v_oovv, cc_space_v_vvoo, &
-      cc_space_v_oovo, cc_space_v_ovvo, cc_space_v_ovoo, cc_space_f_vo)
+      cc_space_v_oovo, cc_space_v_ovvo, cc_space_v_ovov, cc_space_v_ovoo, cc_space_f_vo)
 
   do while (not_converged)
 
diff --git a/devel/ccsd_gpu/ccsd_space_orb_sub_chol.irp.f b/devel/ccsd_gpu/ccsd_space_orb_sub_chol.irp.f
index 277ec98..691074c 100644
--- a/devel/ccsd_gpu/ccsd_space_orb_sub_chol.irp.f
+++ b/devel/ccsd_gpu/ccsd_space_orb_sub_chol.irp.f
@@ -492,11 +492,12 @@ subroutine compute_r2_space_chol(nO,nV,t1,t2,tau,H_oo,H_vv,H_vo,r2,max_r2,gpu_da
 
   double precision, allocatable :: J1(:,:,:,:)
   allocate(J1(nO,nV,nV,nO))
-  J1 = 0.d0
+
+  double precision, allocatable :: K1(:,:,:,:)
+  allocate(K1(nO,nV,nO,nV))
 
   call compute_r2_space_chol_gpu(nO,nV,cholesky_mo_num,gpu_data,t1,t2,tau, &
-      H_vv, g_occ, J1, r2)
-
+      H_vv, g_occ, J1, K1, r2)
 
 !---
   double precision, allocatable :: X_oovv(:,:,:,:)
@@ -506,10 +507,6 @@ subroutine compute_r2_space_chol(nO,nV,t1,t2,tau,H_oo,H_vv,H_vo,r2,max_r2,gpu_da
 
   double precision, allocatable :: X_vovo(:,:,:,:), Y_oovo(:,:,:,:)
 
-  double precision, allocatable :: K1(:,:,:,:)
-  allocate(K1(nO,nV,nO,nV))
-  call compute_K1_chol(nO,nV,t1,t2,cc_space_v_ovoo,cc_space_v_vvoo, &
-       cc_space_v_ovov,K1)
 
   allocate(X_ovvo(nO,nV,nV,nO))
   !$omp parallel &
@@ -721,106 +718,3 @@ subroutine compute_r2_space_chol(nO,nV,t1,t2,tau,H_oo,H_vv,H_vo,r2,max_r2,gpu_da
 
 end
 
-! K1
-
-subroutine compute_K1_chol(nO,nV,t1,t2,v_ovoo,v_vvoo,v_ovov,K1)
-
-  implicit none
-
-  integer, intent(in)           :: nO,nV
-  double precision, intent(in)  :: t1(nO, nV)
-  double precision, intent(in)  :: t2(nO, nO, nV, nV)
-  double precision, intent(in)  :: v_vvoo(nV,nV,nO,nO), v_ovov(nO,nV,nO,nV)
-  double precision, intent(in)  :: v_ovoo(nO,nV,nO,nO)
-  double precision, intent(out) :: K1(nO, nV, nO, nV)
-
-  double precision, allocatable :: X(:,:,:,:), Y(:,:,:,:), Z(:,:,:,:)
-
-  integer :: a,tmp_a,b,k,l,c,d,tmp_c,tmp_d,i,j,u,v, beta, gam
-
-  allocate(X(nV,nO,nV,nO),Y(nO,nV,nV,nO),Z(nO,nV,nV,nO))
-
-  !$omp parallel &
-  !$omp shared(nO,nV,K1,X,Y,v_vvoo,v_ovov,t1,t2) &
-  !$omp private(i,beta,a,u,j,b) &
-  !$omp default(none)
-  !$omp do
-  do beta = 1, nV
-    do i = 1, nO
-      do a = 1, nV
-        do u = 1, nO
-          K1(u,a,i,beta) = v_ovov(u,a,i,beta)
-        enddo
-      enddo
-    enddo
-  enddo
-  !$omp end do nowait
-
-  do i = 1, nO
-    !$omp do
-    do a = 1, nV
-      do j = 1, nO
-        do b = 1, nV
-          X(b,j,a,i) = - v_vvoo(b,a,i,j)
-        enddo
-      enddo
-    enddo
-    !$omp end do nowait
-  enddo
-
-  do j = 1, nO
-    !$omp do
-    do b = 1, nV
-      do beta = 1, nV
-        do u = 1, nO
-          Y(u,beta,b,j) = 0.5d0 * t2(u,j,b,beta) + t1(u,b) * t1(j,beta)
-        enddo
-      enddo
-    enddo
-    !$omp end do
-  enddo
-  !$omp end parallel
-
-  call dgemm('N','N',nO*nV*nO,nV,nO, &
-            -1d0, v_ovoo, size(v_ovoo,1) * size(v_ovoo,2) * size(v_ovoo,3), &
-                  t1    , size(t1,1), &
-            1d0, K1    , size(K1,1) * size(K1,2) * size(K1,3))
-
-  double precision, allocatable :: K1tmp(:,:,:,:), t1v(:,:,:)
-  allocate(K1tmp(nO,nO,nV,nV), t1v(cholesky_mo_num,nO,nO))
-
-  call dgemm('N','T', cholesky_mo_num*nO, nO, nV, 1.d0, &
-    cc_space_v_ov_chol, cholesky_mo_num*nO, t1, nO, 0.d0, &
-    t1v, cholesky_mo_num*nO)
-
-  call dgemm('T','N', nO*nO, nV*nV, cholesky_mo_num, 1.d0, &
-    t1v, cholesky_mo_num, cc_space_v_vv_chol, cholesky_mo_num, 0.d0, &
-    K1tmp, nO*nO)
-
-  deallocate(t1v)
-  ! Y(u,beta,b,j) * X(b,j,a,i) = Z(u,beta,a,i)
-  call dgemm('N','N',nV*nO,nO*nV,nV*nO, &
-             1d0, Y, size(Y,1) * size(Y,2), &
-                  X, size(X,1) * size(X,2), &
-             0d0, Z, size(Z,1) * size(Z,2))
-
-  !$omp parallel &
-  !$omp shared(nO,nV,K1,Z,K1tmp) &
-  !$omp private(i,beta,a,u) &
-  !$omp default(none)
-  !$omp do
-   do beta = 1, nV
-    do i = 1, nO
-      do a = 1, nV
-        do u = 1, nO
-          K1(u,a,i,beta) = K1(u,a,i,beta) + K1tmp(u,i,a,beta) + Z(u,beta,a,i)
-        enddo
-      enddo
-    enddo
-  enddo
-  !$omp end do
-  !$omp end parallel
-
-  deallocate(K1tmp,X,Y,Z)
-
-end
diff --git a/devel/ccsd_gpu/gpu.c b/devel/ccsd_gpu/gpu.c
index 6cdb561..a5827d2 100644
--- a/devel/ccsd_gpu/gpu.c
+++ b/devel/ccsd_gpu/gpu.c
@@ -17,6 +17,7 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
                 double* H_vv,
                 double* g_occ,
                 double* J1,
+                double* K1,
                 double* r2)
 {
 
@@ -50,6 +51,7 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
       double* d_cc_space_v_vvoo    = data[igpu].cc_space_v_vvoo;
       double* d_cc_space_v_oovo    = data[igpu].cc_space_v_oovo;
       double* d_cc_space_v_ovvo    = data[igpu].cc_space_v_ovvo;
+      double* d_cc_space_v_ovov    = data[igpu].cc_space_v_ovov;
       double* d_cc_space_v_ovoo    = data[igpu].cc_space_v_ovoo;
       double* d_cc_space_f_vo      = data[igpu].cc_space_f_vo;
 
@@ -76,7 +78,6 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
       cudaMalloc((void **)&d_t2, nO*nO*nV*nV * sizeof(double));
       cublasSetMatrix(nO*nO, nV*nV, sizeof(double), t2, lda, d_t2, lda);
 
-
       #pragma omp sections
       {
 
@@ -533,19 +534,12 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
                cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_T, nO, nO, &alpha, A, lda, &beta, B, ldb, C, ldc);
             }
           }
-          for (int i=0 ; i<nV ; ++i) {
-            cudaStreamDestroy(stream[i]);
-          }
-          cublasSetStream(handle, NULL);
 
           double* d_X_vovo;
           cudaMalloc((void **)&d_X_vovo, nV*nO*nV*nO * sizeof(double));
 
           alpha = 0.0;
           beta =  1.0;
-          for (int i=0 ; i<nV ; ++i) {
-            cudaStreamCreate(&(stream[i]));
-          }
           for (int i=0 ; i<nO ; ++i) {
             for (int gam=0 ; gam<nV ; ++gam) {
                cublasSetStream(handle, stream[gam]);
@@ -624,7 +618,6 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
 
         #pragma omp section
         {
-
           double* d_J1;
           cudaMalloc((void **)&d_J1, nO*nV*nV*nO * sizeof(double));
 
@@ -792,17 +785,10 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
               cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nO, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
             }
           }
-          for (int i=0 ; i<nV ; ++i) {
-            cudaStreamDestroy(stream[i]);
-          }
-          cublasSetStream(handle, NULL);
 
           double* d_Y_vovo;
           cudaMalloc((void **)&d_Y_vovo, nV*nO*nV*nO * sizeof(double));
 
-          for (int i=0 ; i<nO ; ++i) {
-            cudaStreamCreate(&(stream[i]));
-          }
           alpha = 1.0;
           beta = -0.5;
           for (int j=0 ; j<nO ; ++j) {
@@ -814,17 +800,10 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
               cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_T, nV, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
             }
           }
-          for (int i=0 ; i<nO ; ++i) {
-            cudaStreamDestroy(stream[i]);
-          }
-          cublasSetStream(handle, NULL);
 
           double* d_X_ovvo;
           cudaMalloc((void **)&d_X_ovvo, nO*nV*nV*nO * sizeof(double));
 
-          for (int i=0 ; i<nV ; ++i) {
-            cudaStreamCreate(&(stream[i]));
-          }
           alpha = 1.0;
           beta =  0.0;
           for (int j=0 ; j<nO ; ++j) {
@@ -878,13 +857,144 @@ void compute_r2_space_chol_gpu(const int nO, const int nV, const int cholesky_mo
 
         }
 
-//      #pragma omp section
-//      {
-//      }
+        #pragma omp section
+        {
+          double* d_K1;
+          cudaMalloc((void **)&d_K1, nO*nV*nO*nV * sizeof(double));
+
+          alpha = 1.0;
+          beta =  0.0;
+          A = d_cc_space_v_ovov; lda = nO*nV;
+          B = d_cc_space_v_ovov; ldb = nO*nV;
+          C = d_K1; ldc = nO*nV;
+          cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nO*nV, nO*nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
+
+          alpha = -1.0;
+          beta  = 1.0;
+          m=nO*nV*nO;  n=nV;  k=nO;
+          A=d_cc_space_v_ovoo;  lda=nO*nV*nO;
+          B=d_t1;  ldb=nO;
+          C=d_K1;  ldc=nO*nV*nO;
+          cublasDgemm(handle, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k, &alpha, A, lda, B, ldb, &beta, C, ldc);
+
+          double* d_X;
+          cudaMalloc((void **)&d_X, nV*nO*nV*nO * sizeof(double));
+
+          double* d_Y;
+          cudaMalloc((void **)&d_Y, nO*nV*nV*nO * sizeof(double));
+
+          for (int i=0 ; i<nV ; ++i) {
+            cudaStreamCreate(&(stream[i]));
+          }
+          alpha =-1.0;
+          beta =  0.0;
+          for (int j=0 ; j<nO ; ++j) {
+            for (int i=0 ; i<nO ; ++i) {
+              cublasSetStream(handle, stream[i]);
+              A = &(d_cc_space_v_vvoo[nV*nV*(i+nO*j)]); lda = nV;
+              B = &(d_cc_space_v_vvoo[nV*nV*(i+nO*j)]); ldb = nV;
+              C = &(d_X[nV*(j+nO*nV*i)]); ldc = nV*nO;
+              cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nV, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
+            }
+          }
+
+          alpha = 0.5;
+          for (int j=0 ; j<nO ; ++j) {
+            for (int b=0 ; b<nV ; ++b) {
+              cublasSetStream(handle, stream[b]);
+              beta = t1[j+b*nO];
+              A = &(d_t2[nO*(j+nO*nV*b)]); lda = nO*nO;
+              B = d_t1; ldb = nO;
+              C = &(d_Y[nO*(b+nV*nV*j)]); ldc = nO*nV;
+              cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nO, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
+            }
+          }
+          for (int i=0 ; i<nV ; ++i) {
+            cudaStreamDestroy(stream[i]);
+          }
+          cublasSetStream(handle, NULL);
+
+          double* d_Z;
+          cudaMalloc((void **)&d_Z, nO*nV*nV*nO * sizeof(double));
+
+          alpha = 1.0;
+          beta  = 0.0;
+          m=nV*nO;  n=nO*nV;  k=nV*nO;
+          A=d_Y;  lda=nO*nV;
+          B=d_X;  ldb=nV*nO;
+          C=d_Z;  ldc=nO*nV;
+          cublasDgemm(handle, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k, &alpha, A, lda, B, ldb, &beta, C, ldc);
+
+          cudaFree(d_X);
+          cudaFree(d_Y);
+
+
+          double* d_t1v;
+          cudaMalloc((void **)&d_t1v, cholesky_mo_num*nO*nO * sizeof(double));
+
+          alpha = 1.0;
+          beta  = 0.0;
+          m=cholesky_mo_num*nO;  n=nO;  k=nV;
+          A=d_cc_space_v_ov_chol;  lda=cholesky_mo_num*nO;
+          B=d_t1;  ldb=nO;
+          C=d_t1v;  ldc=cholesky_mo_num*nO;
+          cublasDgemm(handle, CUBLAS_OP_N, CUBLAS_OP_T, m, n, k, &alpha, A, lda, B, ldb, &beta, C, ldc);
+
+          double* d_K1tmp;
+          cudaMalloc((void **)&d_K1tmp, nO*nO*nV*nV * sizeof(double));
+
+          alpha = 1.0;
+          beta  = 0.0;
+          m=nO*nO;  n=nV*nV;  k=cholesky_mo_num;
+          A=d_t1v;  lda=cholesky_mo_num;
+          B=d_cc_space_v_vv_chol;  ldb=cholesky_mo_num;
+          C=d_K1tmp;  ldc=nO*nO;
+          cublasDgemm(handle, CUBLAS_OP_T, CUBLAS_OP_N, m, n, k, &alpha, A, lda, B, ldb, &beta, C, ldc);
+          cudaFree(d_t1v);
+
+
+          for (int i=0 ; i<nV ; ++i) {
+            cudaStreamCreate(&(stream[i]));
+          }
+          alpha = 1.0;
+          beta =  1.0;
+          for (int i=0 ; i<nO ; ++i) {
+            for (int b=0 ; b<nV ; ++b) {
+              cublasSetStream(handle, stream[b]);
+              A = &(d_K1[nO*nV*(i+nO*b)]); lda = nO;
+              B = &(d_K1tmp[nO*(i+nO*nV*b)]); ldb = nO*nO;
+              C = &(d_K1[nO*nV*(i+nO*b)]); ldc = nO;
+              cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nO, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
+            }
+          }
+
+          for (int i=0 ; i<nO ; ++i) {
+            for (int b=0 ; b<nV ; ++b) {
+              cublasSetStream(handle, stream[b]);
+              A = &(d_K1[nO*nV*(i+nO*b)]); lda = nO;
+              B = &(d_Z[nO*(b+nV*nV*i)]); ldb = nO*nV;
+              C = &(d_K1[nO*nV*(i+nO*b)]); ldc = nO;
+              cublasDgeam(handle, CUBLAS_OP_N, CUBLAS_OP_N, nO, nV, &alpha, A, lda, &beta, B, ldb, C, ldc);
+            }
+          }
+
+          for (int i=0 ; i<nV ; ++i) {
+            cudaStreamDestroy(stream[i]);
+          }
+          cublasSetStream(handle, NULL);
+          cudaFree(d_K1tmp);
+//          cudaFree(d_Z);
+
+          lda = nO*nV;
+          cublasGetMatrix(nO*nV, nO*nV, sizeof(double), d_K1, lda, K1, lda);
+          cudaFree(d_K1);
+
+        }
 
       } // end sections
 
 
+
       lda = cholesky_mo_num * nV;
       cudaMalloc((void **)&d_tmp_cc, lda * nV * sizeof(double));
 
diff --git a/devel/ccsd_gpu/gpu.h b/devel/ccsd_gpu/gpu.h
index 93dd5e2..38a044f 100644
--- a/devel/ccsd_gpu/gpu.h
+++ b/devel/ccsd_gpu/gpu.h
@@ -9,6 +9,7 @@ typedef struct {
    double* cc_space_v_vvoo;
    double* cc_space_v_oovo;
    double* cc_space_v_ovvo;
+   double* cc_space_v_ovov;
    double* cc_space_v_ovoo;
    double* cc_space_f_vo;
 } gpu_data;
diff --git a/devel/ccsd_gpu/gpu_init.c b/devel/ccsd_gpu/gpu_init.c
index dc58a73..5105fc2 100644
--- a/devel/ccsd_gpu/gpu_init.c
+++ b/devel/ccsd_gpu/gpu_init.c
@@ -15,7 +15,8 @@ gpu_data* gpu_init(
    double* cc_space_v_oooo, double* cc_space_v_vooo,
    double* cc_space_v_oovv, double* cc_space_v_vvoo,
    double* cc_space_v_oovo, double* cc_space_v_ovvo,
-   double* cc_space_v_ovoo, double* cc_space_f_vo)
+   double* cc_space_v_ovov, double* cc_space_v_ovoo,
+   double* cc_space_f_vo)
 {
     int ngpus = 1;
     cudaGetDeviceCount(&ngpus);
@@ -77,6 +78,11 @@ gpu_data* gpu_init(
       cudaMalloc((void **)&d_cc_space_v_ovvo, nO*nV*nV*nO * sizeof(double));
       cublasSetMatrix(lda, nV*nO, sizeof(double), cc_space_v_ovvo, lda, d_cc_space_v_ovvo, lda);
 
+      double* d_cc_space_v_ovov;
+      lda = nO*nV;
+      cudaMalloc((void **)&d_cc_space_v_ovov, nO*nV*nV*nO * sizeof(double));
+      cublasSetMatrix(lda, nV*nO, sizeof(double), cc_space_v_ovov, lda, d_cc_space_v_ovov, lda);
+
       double* d_cc_space_v_ovoo;
       lda = nO*nV;
       cudaMalloc((void **)&d_cc_space_v_ovoo, nO*nV*nO*nO * sizeof(double));
@@ -96,6 +102,7 @@ gpu_data* gpu_init(
       data[igpu].cc_space_v_vvoo = d_cc_space_v_vvoo;
       data[igpu].cc_space_v_oovo = d_cc_space_v_oovo;
       data[igpu].cc_space_v_ovvo = d_cc_space_v_ovvo;
+      data[igpu].cc_space_v_ovov = d_cc_space_v_ovov;
       data[igpu].cc_space_v_ovoo = d_cc_space_v_ovoo;
       data[igpu].cc_space_f_vo = d_cc_space_f_vo;
     }
diff --git a/devel/ccsd_gpu/gpu_module.f90 b/devel/ccsd_gpu/gpu_module.f90
index 3653a03..992df14 100644
--- a/devel/ccsd_gpu/gpu_module.f90
+++ b/devel/ccsd_gpu/gpu_module.f90
@@ -7,7 +7,8 @@ module gpu_module
     type(c_ptr) function gpu_init(nO, nV, cholesky_mo_num, &
       cc_space_v_oo_chol, cc_space_v_ov_chol, cc_space_v_vo_chol, cc_space_v_vv_chol, &
       cc_space_v_oooo, cc_space_v_vooo, cc_space_v_oovv, cc_space_v_vvoo, &
-      cc_space_v_oovo, cc_space_v_ovvo, cc_space_v_ovoo, cc_space_f_vo) bind(C)
+      cc_space_v_oovo, cc_space_v_ovvo, cc_space_v_ovov, cc_space_v_ovoo, &
+      cc_space_f_vo) bind(C)
         import c_int, c_double, c_ptr
         integer(c_int), intent(in), value :: nO, nV, cholesky_mo_num
         real(c_double), intent(in)  :: cc_space_v_oo_chol(cholesky_mo_num,nO,nO)
@@ -20,12 +21,13 @@ module gpu_module
         real(c_double), intent(in)  :: cc_space_v_vvoo(nV,nV,nO,nO)
         real(c_double), intent(in)  :: cc_space_v_oovo(nO,nO,nV,nO)
         real(c_double), intent(in)  :: cc_space_v_ovvo(nO,nV,nV,nO)
+        real(c_double), intent(in)  :: cc_space_v_ovov(nO,nV,nO,nV)
         real(c_double), intent(in)  :: cc_space_v_ovoo(nO,nV,nO,nO)
         real(c_double), intent(in)  :: cc_space_f_vo(nV,nO)
     end function
 
     subroutine compute_r2_space_chol_gpu(nO,nV,cholesky_mo_num, gpu_data, t1, t2, tau,&
-          H_vv, g_occ, J1, r2) bind(C)
+          H_vv, g_occ, J1, K1, r2) bind(C)
         import c_int, c_double, c_ptr
         integer(c_int), intent(in), value :: nO, nV, cholesky_mo_num
         type(c_ptr), value    :: gpu_data
@@ -35,6 +37,7 @@ module gpu_module
         real(c_double), intent(in)  :: H_vv(nV,nV)
         real(c_double), intent(in)  :: g_occ(nO,nO)
         real(c_double)              :: J1(nO,nV,nV,nO)
+        real(c_double)              :: K1(nO,nV,nO,nV)
         real(c_double), intent(out) :: r2(nO,nO,nV,nV)
     end subroutine