diff --git a/plugins/GSdx/GSRenderer.h b/plugins/GSdx/GSRenderer.h
index 78309b2d40..7165dd3743 100644
--- a/plugins/GSdx/GSRenderer.h
+++ b/plugins/GSdx/GSRenderer.h
@@ -69,7 +69,7 @@ public:
 	virtual bool CanUpscale() {return false;}
 	virtual int GetUpscaleMultiplier() {return 1;}
 	virtual GSVector2i GetInternalResolution() {
-		return GSVector2i(GetDisplayRect().width(), GetDisplayRect().height());
+		return GetOutputRect();
 	}
 	void SetAspectRatio(int aspect) {m_aspectratio = aspect;}
 	void SetVSync(bool enabled);
diff --git a/plugins/GSdx/GSRendererHW.cpp b/plugins/GSdx/GSRendererHW.cpp
index f960c5c9ab..29637b97fa 100644
--- a/plugins/GSdx/GSRendererHW.cpp
+++ b/plugins/GSdx/GSRendererHW.cpp
@@ -116,7 +116,7 @@ int GSRendererHW::GetUpscaleMultiplier()
 }
 
 GSVector2i GSRendererHW::GetInternalResolution() {
-	GSVector2i dr(GetDisplayRect().width(), GetDisplayRect().height());
+	GSVector2i dr = GetOutputRect();
 
 	if (m_upscale_multiplier)
 		return GSVector2i(dr.x * m_upscale_multiplier, dr.y * m_upscale_multiplier);
diff --git a/plugins/GSdx/GSState.cpp b/plugins/GSdx/GSState.cpp
index 8d318b72a3..63f10fa306 100644
--- a/plugins/GSdx/GSState.cpp
+++ b/plugins/GSdx/GSState.cpp
@@ -467,6 +467,28 @@ GSVector2i GSState::GetDeviceSize(int i)
 	return DeviceSize;
 }
 
+GSVector2i GSState::GetOutputRect()
+{
+	GSVector2i Merged_Rectangle(GetDisplayRect().width(), GetDisplayRect().height());
+	GSVector4i Rectangle[2] = { GetDisplayRect(0) , GetDisplayRect(1) };
+	int width[2] = { Rectangle[0].width() , Rectangle[1].width() };
+	int height[2] = { Rectangle[0].height() , Rectangle[1].height() };
+	int x_offset[2] = { Rectangle[0].left , Rectangle[1].left };
+	int y_offset[2] = { Rectangle[0].top , Rectangle[1].top };
+
+	if (!(IsEnabled(0) && IsEnabled(1)))
+		return Merged_Rectangle;
+
+	if (width[0] == width[1] && width[0] == std::max(x_offset[0], x_offset[1]) - std::min(x_offset[0], x_offset[1]))
+		Merged_Rectangle.x <<= 1;
+
+	if (height[0] == height[1] && height[0] == std::max(y_offset[0], y_offset[1]) - std::min(y_offset[0], y_offset[1]))
+		Merged_Rectangle.y <<= 1;
+
+	return Merged_Rectangle;
+
+}
+
 bool GSState::IsEnabled(int i)
 {
 	ASSERT(i >= 0 && i < 2);
diff --git a/plugins/GSdx/GSState.h b/plugins/GSdx/GSState.h
index c2078a0062..e50970af69 100644
--- a/plugins/GSdx/GSState.h
+++ b/plugins/GSdx/GSState.h
@@ -239,6 +239,7 @@ public:
 	GSVector4i GetDisplayRect(int i = -1);
 	GSVector4i GetFrameRect(int i = -1);
 	GSVector2i GetDeviceSize(int i = -1);
+	GSVector2i GetOutputRect(); //Final Output rectangle after passing through merge circuit.
 	GSVideoMode GetVideoMode();
 
 	bool IsEnabled(int i);