diff --git a/Source/Core/VideoCommon/Src/Fifo.cpp b/Source/Core/VideoCommon/Src/Fifo.cpp
index 1325408294..c8d8d79b83 100644
--- a/Source/Core/VideoCommon/Src/Fifo.cpp
+++ b/Source/Core/VideoCommon/Src/Fifo.cpp
@@ -32,6 +32,8 @@
 volatile u32 g_XFBUpdateRequested = FALSE;
 extern u8* g_pVideoData;
 
+volatile bool g_EFBAccessRequested = false;
+
 namespace {
 
 static volatile bool fifoStateRun = false;
@@ -139,6 +141,12 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
 		video_initialize.pPeekMessages();
 #endif
 
+		if (g_EFBAccessRequested)
+		{
+			Video_OnThreadAccessEFB();
+			g_EFBAccessRequested = false;
+		}
+
 		// Draw XFB if CP/GPfifo isn't used
 		if (g_XFBUpdateRequested)
 		{
diff --git a/Source/Core/VideoCommon/Src/VideoCommon.h b/Source/Core/VideoCommon/Src/VideoCommon.h
index be393a60f2..78006e8693 100644
--- a/Source/Core/VideoCommon/Src/VideoCommon.h
+++ b/Source/Core/VideoCommon/Src/VideoCommon.h
@@ -57,6 +57,8 @@ extern SVideoInitialize g_VideoInitialize;
 // (mb2) for XFB update hack. TODO: find a static better place
 extern volatile u32 g_XFBUpdateRequested;
 
+extern volatile bool g_EFBAccessRequested;
+
 //////////////////////////////////////////////////////////////////////////
 inline u8 *Memory_GetPtr(u32 _uAddress)
 {
diff --git a/Source/PluginSpecs/pluginspecs_video.h b/Source/PluginSpecs/pluginspecs_video.h
index 4cbdba0579..780d4e7915 100644
--- a/Source/PluginSpecs/pluginspecs_video.h
+++ b/Source/PluginSpecs/pluginspecs_video.h
@@ -126,6 +126,7 @@ EXPORT void CALL Video_UpdateXFB(u32 _dwXFBAddr, u32 _dwWidth, u32 _dwHeight, s3
 // output:   response to the access request (ex: peek z data at specified coord)
 //
 EXPORT u32 CALL Video_AccessEFB(EFBAccessType type, u32 x, u32 y);
+void Video_OnThreadAccessEFB(); // TODO: Find a more sympathetic place to place this
 
 // __________________________________________________________________________________________________
 // Function: Video_Screenshot
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
index 2501b29159..80ee9fff15 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_Zelda_Synth.cpp
@@ -87,8 +87,7 @@ _lRestart:
 	else
 		PB.RemLength -= pos[1];
 
-	PB.CurAddr += pos[1] << 1;
-	// There should be a position fraction as well.
+	//PB.CurSampleFrac = TrueSamplePosition & 0xFFFF;
 }
 
 
diff --git a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
index 8ba23d64b8..4ca2d6be6c 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/Render.cpp
@@ -907,7 +907,6 @@ void Renderer::Swap(u32 xfbAddr, u32 srcWidth, u32 srcHeight, s32 yOffset)
 		s_bLastFrameDumped = false;
 	}
 #endif
-	// ---------------------------------------------------------------------
 
 	// Place messages on the picture, then copy it to the screen
     SwapBuffers();
diff --git a/Source/Plugins/Plugin_VideoOGL/Src/main.cpp b/Source/Plugins/Plugin_VideoOGL/Src/main.cpp
index 874fe05507..eb9a4e7299 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/main.cpp
+++ b/Source/Plugins/Plugin_VideoOGL/Src/main.cpp
@@ -96,6 +96,11 @@ int GLScissorX, GLScissorY, GLScissorW, GLScissorH;
 
 static bool s_PluginInitialized = false;
 
+static volatile u32 s_AccessEFBResult = 0, s_EFBx, s_EFBy;
+static volatile EFBAccessType s_AccessEFBType;
+static Common::Event s_AccessEFBDone;
+static Common::CriticalSection s_criticalEFB;
+
 #if defined(HAVE_WX) && HAVE_WX
 void DllDebugger(HWND _hParent, bool Show)
 {
@@ -458,36 +463,36 @@ void Video_UpdateXFB(u32 _dwXFBAddr, u32 _dwWidth, u32 _dwHeight, s32 _dwYOffset
 	}
 }
 
-u32 Video_AccessEFB(EFBAccessType type, u32 x, u32 y)
+void Video_OnThreadAccessEFB()
 {
-	switch (type)
+	s_criticalEFB.Enter();
+	s_AccessEFBResult = 0;
+
+	switch (s_AccessEFBType)
 	{
 	case PEEK_Z:
 		{
-			if (!g_VideoInitialize.bUseDualCore)
+			u32 z = 0;
+			float xScale = Renderer::GetTargetScaleX();
+			float yScale = Renderer::GetTargetScaleY();
+
+			if (g_Config.iMultisampleMode != MULTISAMPLE_OFF)
 			{
-				u32 z = 0;
-				float xScale = Renderer::GetTargetScaleX();
-				float yScale = Renderer::GetTargetScaleY();
-
-				if (g_Config.iMultisampleMode != MULTISAMPLE_OFF)
-				{
-					// Find the proper dimensions
-					TRectangle source, scaledTargetSource;
-					ComputeBackbufferRectangle(&source);
-					source.Scale(xScale, yScale, &scaledTargetSource);
-					// This will resolve and bind to the depth buffer
-					glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, Renderer::ResolveAndGetDepthTarget(scaledTargetSource));
-				}
-
-				// Read the z value! Also adjust the pixel to read to the upscaled EFB resolution
-				// Plus we need to flip the y value as the OGL image is upside down
-				glReadPixels(x*xScale, Renderer::GetTargetHeight() - y*yScale, xScale, yScale, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, &z);
-				GL_REPORT_ERRORD();
-
-				// Clamp the 32bits value returned by glReadPixels to a 24bits value (GC uses a 24bits Z-Buffer)
-				return z / 0x100;
+				// Find the proper dimensions
+				TRectangle source, scaledTargetSource;
+				ComputeBackbufferRectangle(&source);
+				source.Scale(xScale, yScale, &scaledTargetSource);
+				// This will resolve and bind to the depth buffer
+				glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, Renderer::ResolveAndGetDepthTarget(scaledTargetSource));
 			}
+
+			// Read the z value! Also adjust the pixel to read to the upscaled EFB resolution
+			// Plus we need to flip the y value as the OGL image is upside down
+			glReadPixels(s_EFBx*xScale, Renderer::GetTargetHeight() - s_EFBy*yScale, xScale, yScale, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, &z);
+			GL_REPORT_ERRORD();
+
+			// Clamp the 32bits value returned by glReadPixels to a 24bits value (GC uses a 24bits Z-Buffer)
+			s_AccessEFBResult = z / 0x100;
 		}
 		break;
 
@@ -503,6 +508,42 @@ u32 Video_AccessEFB(EFBAccessType type, u32 x, u32 y)
 	default:
 		break;
 	}
-	return 0;
+	
+	s_AccessEFBDone.Set();
+
+	s_criticalEFB.Leave();
+}
+
+u32 Video_AccessEFB(EFBAccessType type, u32 x, u32 y)
+{
+	u32 result;
+
+	s_criticalEFB.Enter();
+
+	s_AccessEFBType = type;
+	s_EFBx = x;
+	s_EFBy = y;
+
+	if (g_VideoInitialize.bUseDualCore)
+	{
+		g_EFBAccessRequested = true;
+		s_AccessEFBDone.Init();
+	}
+
+	s_criticalEFB.Leave();
+
+	if (g_VideoInitialize.bUseDualCore)
+		s_AccessEFBDone.Wait();
+	else
+		Video_OnThreadAccessEFB();
+
+	s_criticalEFB.Enter();
+	if (g_VideoInitialize.bUseDualCore)
+		s_AccessEFBDone.Shutdown();
+
+	result = s_AccessEFBResult;
+	s_criticalEFB.Leave();
+
+	return result;
 }