diff --git a/CloneSource.cpp b/CloneSource.cpp
index 07e53da..18d1b1e 100644
--- a/CloneSource.cpp
+++ b/CloneSource.cpp
@@ -161,7 +161,7 @@ void CloneSource::update(float dt)
             if ( images_.empty() || now - elapsed_.front() < delay_ + (dt * 0.001) )
             {
                 // create a FBO if none can be reused (from above) and test for RAM in GPU
-                if (garbage_image_ == nullptr && ( images_.empty() || FrameBuffer::shouldHaveEnoughMemory(origin_->frame()->resolution(), origin_->frame()->use_alpha()) ) )
+                if (garbage_image_ == nullptr && ( images_.empty() || Rendering::shouldHaveEnoughMemory(origin_->frame()->resolution(), origin_->frame()->use_alpha()) ) )
                     garbage_image_ = new FrameBuffer( origin_->frame()->resolution(), origin_->frame()->use_alpha() );
                 // image available
                 if (garbage_image_ != nullptr) {
diff --git a/FrameBuffer.cpp b/FrameBuffer.cpp
index 9944211..288aade 100644
--- a/FrameBuffer.cpp
+++ b/FrameBuffer.cpp
@@ -35,10 +35,6 @@
 #define FRAMEBUFFER_DEBUG
 #endif
 
-#define GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX 0x9048
-#define GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX 0x9049
-#define GL_TEXTURE_FREE_MEMORY_ATI		0x87FC
-
 const char* FrameBuffer::aspect_ratio_name[5] = { "4:3", "3:2", "16:10", "16:9", "21:9" };
 glm::vec2 FrameBuffer::aspect_ratio_size[5] = { glm::vec2(4.f,3.f), glm::vec2(3.f,2.f), glm::vec2(16.f,10.f), glm::vec2(16.f,9.f) , glm::vec2(21.f,9.f) };
 const char* FrameBuffer::resolution_name[5] = { "720", "1080", "1200", "1440", "2160" };
@@ -363,7 +359,7 @@ void FrameBuffer::checkFramebufferStatus()
         if ( framebufferMemoryInKB > 8000 ) {
 
             // Obtain RAM usage in GPU (if possible)
-            glm::ivec2 RAM = getGPUMemoryInformation();
+            glm::ivec2 RAM = Rendering::getGPUMemoryInformation();
 
             // bad case: not enough RAM, we should warn the user
             if ( RAM.x < framebufferMemoryInKB * 3 ) {
@@ -388,64 +384,6 @@ void FrameBuffer::checkFramebufferStatus()
 
 }
 
-// RAM usage in GPU
-// returns { CurAvailMemoryInKB, TotalMemoryInKB }
-// MAX values means the info in not available
-glm::ivec2 FrameBuffer::getGPUMemoryInformation()
-{
-    glm::ivec2 ret(INT_MAX, INT_MAX);
-
-    // Detect method to get info
-    static int meminfomode = -1;
-    if (meminfomode<0) {
-        // initialized
-        meminfomode = 0;
-        GLint numExtensions = 0;
-        glGetIntegerv( GL_NUM_EXTENSIONS, &numExtensions );
-        for (int i = 0; i < numExtensions; ++i){
-            const GLubyte *ccc = glGetStringi(GL_EXTENSIONS, i);
-            // NVIDIA extension available
-            if ( strcmp( (const char*)ccc, "GL_NVX_gpu_memory_info") == 0 ){
-                meminfomode = 1;
-                break;
-            }
-            // ATI extension available
-            else if ( strcmp( (const char*)ccc, "GL_ATI_meminfo") == 0 ){
-                meminfomode = 2;
-                break;
-            }
-        }
-
-    }
-
-    // NVIDIA
-    if (meminfomode == 1) {
-        static GLint nTotalMemoryInKB = -1;
-        if (nTotalMemoryInKB<0)
-            glGetIntegerv( GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX,  &nTotalMemoryInKB );
-        ret.y = nTotalMemoryInKB;
-
-        glGetIntegerv( GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX, &ret.x );
-    }
-    // ATI
-    else if (meminfomode == 2) {
-        glGetIntegerv( GL_TEXTURE_FREE_MEMORY_ATI, &ret.x );
-    }
-
-    return ret;
-}
-
-
-bool FrameBuffer::shouldHaveEnoughMemory(glm::vec3 resolution, bool useAlpha, bool multiSampling)
-{
-    glm::ivec2 RAM = getGPUMemoryInformation();
-
-    // approximation of RAM needed for such FBO
-    GLint framebufferMemoryInKB = ( resolution.x * resolution.x * (useAlpha?4:3) * (multiSampling?2:1) ) / 1024;
-
-    return ( RAM.x > framebufferMemoryInKB * 3 );
-}
-
 
 glm::mat4 FrameBuffer::projection() const
 {
diff --git a/FrameBuffer.h b/FrameBuffer.h
index 4285a07..a44673d 100644
--- a/FrameBuffer.h
+++ b/FrameBuffer.h
@@ -44,9 +44,6 @@ public:
     static float resolution_height[5];
     static glm::vec3 getResolutionFromParameters(int ar, int h);
     static glm::ivec2 getParametersFromResolution(glm::vec3 res);
-    // memory management
-    static glm::ivec2 getGPUMemoryInformation();
-    static bool shouldHaveEnoughMemory(glm::vec3 resolution, bool useAlpha = false, bool multiSampling = false);
 
     FrameBuffer(glm::vec3 resolution, bool useAlpha = false, bool multiSampling = false);
     FrameBuffer(uint width, uint height, bool useAlpha = false, bool multiSampling = false);
diff --git a/RenderingManager.cpp b/RenderingManager.cpp
index 7acd4bc..dec2d39 100644
--- a/RenderingManager.cpp
+++ b/RenderingManager.cpp
@@ -467,6 +467,71 @@ void Rendering::requestScreenshot()
 }
 
 
+// RAM usage in GPU
+// returns { CurAvailMemoryInKB, TotalMemoryInKB }
+// MAX values means the info in not available
+
+#define GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX 0x9048
+#define GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX 0x9049
+#define GL_TEXTURE_FREE_MEMORY_ATI		0x87FC
+
+glm::ivec2 Rendering::getGPUMemoryInformation()
+{
+    glm::ivec2 ret(INT_MAX, INT_MAX);
+
+    // Detect method to get info
+    static int meminfomode = -1;
+    if (meminfomode<0) {
+        // initialized
+        meminfomode = 0;
+        GLint numExtensions = 0;
+        glGetIntegerv( GL_NUM_EXTENSIONS, &numExtensions );
+        for (int i = 0; i < numExtensions; ++i){
+            const GLubyte *ccc = glGetStringi(GL_EXTENSIONS, i);
+            // NVIDIA extension available
+            if ( strcmp( (const char*)ccc, "GL_NVX_gpu_memory_info") == 0 ){
+                meminfomode = 1;
+                break;
+            }
+            // ATI extension available
+            else if ( strcmp( (const char*)ccc, "GL_ATI_meminfo") == 0 ){
+                meminfomode = 2;
+                break;
+            }
+        }
+
+    }
+
+    // NVIDIA
+    if (meminfomode == 1) {
+        static GLint nTotalMemoryInKB = -1;
+        if (nTotalMemoryInKB<0)
+            glGetIntegerv( GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX,  &nTotalMemoryInKB );
+        ret.y = nTotalMemoryInKB;
+
+        glGetIntegerv( GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX, &ret.x );
+    }
+    // ATI
+    else if (meminfomode == 2) {
+        glGetIntegerv( GL_TEXTURE_FREE_MEMORY_ATI, &ret.x );
+    }
+
+    return ret;
+}
+
+
+bool Rendering::shouldHaveEnoughMemory(glm::vec3 resolution, bool useAlpha, bool multiSampling)
+{
+    glm::ivec2 RAM = getGPUMemoryInformation();
+
+    // approximation of RAM needed for such FBO
+    GLint framebufferMemoryInKB = ( resolution.x * resolution.x * (useAlpha?4:3) * (multiSampling?2:1) ) / 1024;
+
+    return ( RAM.x > framebufferMemoryInKB * 3 );
+}
+
+
+
 // custom surface with a new VAO
 class WindowSurface : public Primitive {
 
diff --git a/RenderingManager.h b/RenderingManager.h
index c9517a5..b9e295a 100644
--- a/RenderingManager.h
+++ b/RenderingManager.h
@@ -147,6 +147,10 @@ public:
     // project from scene coordinate to window
     glm::vec2 project(glm::vec3 scene_coordinate, glm::mat4 modelview = glm::mat4(1.f), bool to_framebuffer = true);
 
+    // memory management
+    static glm::ivec2 getGPUMemoryInformation();
+    static bool shouldHaveEnoughMemory(glm::vec3 resolution, bool useAlpha = false, bool multiSampling = false);
+
 #ifdef USE_GST_OPENGL_SYNC_HANDLER
     // for opengl pipeline in gstreamer
     static void LinkPipeline( GstPipeline *pipeline );