diff --git a/README.md b/README.md
index 4258016..deed04e 100644
--- a/README.md
+++ b/README.md
@@ -2,14 +2,17 @@
 Flake for running SD on NixOS
 
 ## What's done
-* Nix devShell capable of running InvokeAI's flavor of SD without need to fallback for pip or conda (targets AMD ROCM)
+* Nix devShell capable of running InvokeAI's flavor of SD without need to fallback for pip or conda (including AMD ROCM support)
 * ...???
 * PROFIT
 
 # How to use it?
 1. Clone repo
 1. Clone submodule with InvokeAI
-1. Run `nix develop`, wait for shell to build
+1. Run `nix develop .#invokeai.{default,nvidia,amd}`, wait for shell to build
+    1. `.#invokeai.default` builds shell which overrides bare minimum required for SD to run
+    1. `.#invokeai.amd` builds shell which overrides torch packages with ROCM-enabled bin versions
+    1. `.#invokeai.nvidia` builds shell with overlay explicitly setting `cudaSupport = true` for torch
 1. Inside InvokeAI's directory, run `python scripts/preload_models.py` to preload models
 1. Place SD weights into `models/ldm/stable-diffusion-v1/model.ckpt`
 1. Run CLI with `python scripts/invoke.py` or GUI with `python scripts/invoke.py --web`
@@ -17,7 +20,7 @@ Flake for running SD on NixOS
 
 ## What's needed to be done
 
-- [ ] devShell with CUDA support (should be trivial, but requires volunteer with NVidia GPU) 
+- [x] devShell with CUDA support (should be trivial, but requires volunteer with NVidia GPU) 
 - [ ] Missing packages definitions should be submitted to Nixpkgs
 - [ ] Investigate ROCM device warning on startup
 - [ ] Apply patches so that all downloaded models would go into one specific folder
diff --git a/flake.nix b/flake.nix
index 8725780..af331bc 100644
--- a/flake.nix
+++ b/flake.nix
@@ -113,6 +113,14 @@
           });
           torch = torch-bin;
           torchvision = torchvision-bin;
+          #overriding because of https://github.com/NixOS/nixpkgs/issues/196653
+          opencv4 = pythonPackages.opencv4.override { openblas = nixpkgs.blas; };
+        };
+      overlay_nvidia = nixpkgs: pythonPackages:
+        {
+          torch = pythonPackages.torch.override {
+            cudaSupport = true;
+          };
         };
     in
     {
@@ -122,7 +130,19 @@
           let
             nixpkgs_ = import inputs.nixpkgs {
               inherit system;
-              config.allowUnfree = true; #both CUDA and MKL are unfree
+              overlays = [
+                (final: prev: {
+                  python3 = prev.python3.override {
+                    packageOverrides =
+                      python-self: python-super:
+                      (overlay_default prev python-super) //
+                      (overlay_pynixify python-self);
+                  };
+                })
+              ];
+            };
+            nixpkgs_amd = import inputs.nixpkgs {
+              inherit system;
               overlays = [
                 (final: prev: {
                   python3 = prev.python3.override {
@@ -131,31 +151,54 @@
                       (overlay_default prev python-super) //
                       (overlay_amd prev python-super) //
                       (overlay_pynixify python-self);
-                      #((import ./pynixify/overlay.nix) python-self python-super);
+                  };
+                })
+              ];
+            };
+            nixpkgs_nvidia = import inputs.nixpkgs {
+              inherit system;
+              config.allowUnfree = true; #CUDA is unfree
+              overlays = [
+                (final: prev: {
+                  python3 = prev.python3.override {
+                    packageOverrides =
+                      python-self: python-super:
+                      (overlay_default prev python-super) //
+                      (overlay_nvidia prev python-super) //
+                      (overlay_pynixify python-self);
                   };
                 })
               ];
             };
           in
           rec {
-            invokeai-amd = nixpkgs_.mkShell 
-            (let 
-              lapack = nixpkgs_.lapack.override { lapackProvider = nixpkgs_.mkl; };
-              blas = nixpkgs_.lapack.override { lapackProvider = nixpkgs_.mkl; };
-            in
-            {
-              name = "invokeai-amd";
-              propagatedBuildInputs = requirements nixpkgs_;
-              shellHook = ''
-                #on my machine SD segfaults somewhere inside scipy with openblas, so I had to use another blas impl
-                #build of scipy with non-default blas is broken, therefore overriding lib in runtime
-
-                export NIXPKGS_ALLOW_UNFREE=1
-                export LD_LIBRARY_PATH=${lapack}/lib:${blas}/lib
-                cd InvokeAI
-              '';
-            });
-            default = invokeai-amd;
+            invokeai = {
+              default = nixpkgs_amd.mkShell
+                ({
+                  name = "invokeai";
+                  propagatedBuildInputs = requirements nixpkgs_;
+                  shellHook = ''
+                    cd InvokeAI
+                  '';
+                });
+              amd = nixpkgs_amd.mkShell
+                ({
+                  name = "invokeai.amd";
+                  propagatedBuildInputs = requirements nixpkgs_amd;
+                  shellHook = ''
+                    cd InvokeAI
+                  '';
+                });
+              nvidia = nixpkgs_nvidia.mkShell
+                ({
+                  name = "invokeai.nvidia";
+                  propagatedBuildInputs = requirements nixpkgs_nvidia;
+                  shellHook = ''
+                    cd InvokeAI
+                  '';
+                });
+            };
+            default = invokeai.amd;
           });
     };
 }