diff --git a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
index 0b0df6a15..d582b134d 100644
--- a/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
+++ b/src/core/hle/D3D8/Direct3D9/Direct3D9.cpp
@@ -2456,10 +2456,7 @@ void Direct3D_CreateDevice_End()
 	// Set g_XboxD3DDevice to point to the Xbox D3D Device
 	auto it = g_SymbolAddresses.find("D3DDEVICE");
 	if (it != g_SymbolAddresses.end()) {
-		xbaddr dwD3DDevice = it->second;
-		if (dwD3DDevice != xbnull) {
-			g_XboxD3DDevice = *((DWORD**)dwD3DDevice);
-		}
+        g_XboxD3DDevice = (DWORD*)it->second;
     }
 }
 
@@ -2515,6 +2512,35 @@ HRESULT WINAPI XTL::EMUPATCH(Direct3D_CreateDevice_16)
 	return hRet;
 }
 
+// ******************************************************************
+// * patch: D3DDevice_SetIndices_4
+// LTCG specific D3DDevice_SetIndices function...
+// This uses a custom calling convention where parameter is passed in EBX and Stack
+// Test Case: Conker
+// ******************************************************************
+VOID WINAPI XTL::EMUPATCH(D3DDevice_SetIndices_4)
+(
+    UINT                BaseVertexIndex
+)
+{
+    X_D3DIndexBuffer   *pIndexData;
+
+    __asm {
+        mov pIndexData, ebx
+    }
+    // Cache the base vertex index
+    g_XboxBaseVertexIndex = BaseVertexIndex;
+
+    // Call LTCG-specific trampoline
+    XB_trampoline(VOID, WINAPI, D3DDevice_SetIndices_4, (UINT));
+    __asm {
+        mov ebx, pIndexData
+        push BaseVertexIndex
+        call XB_D3DDevice_SetIndices_4;
+    }
+}
+
+
 // ******************************************************************
 // * patch: D3DDevice_SetIndices
 // ******************************************************************
@@ -7436,6 +7462,27 @@ VOID WINAPI XTL::EMUPATCH(D3DDevice_SetPixelShader)
 	D3DDevice_SetPixelShaderCommon(Handle);
 }
 
+// ******************************************************************
+// * patch: D3DDevice_DrawVertices_4
+// LTCG specific D3DDevice_DrawVertices function...
+// This uses a custom calling convention where parameter is passed in ECX, EAX and Stack
+// Test Case: Conker
+// ******************************************************************
+VOID WINAPI XTL::EMUPATCH(D3DDevice_DrawVertices_4)
+(
+    X_D3DPRIMITIVETYPE  PrimitiveType
+)
+{
+    UINT VertexCount;
+    UINT StartVertex;
+    
+    _asm {
+        mov VertexCount, eax
+        mov StartVertex, ecx
+    }
+
+    EMUPATCH(D3DDevice_DrawVertices)(PrimitiveType, StartVertex, VertexCount);
+}
 
 // ******************************************************************
 // * patch: D3DDevice_DrawVertices
diff --git a/src/core/hle/D3D8/Direct3D9/Direct3D9.h b/src/core/hle/D3D8/Direct3D9/Direct3D9.h
index c5ab745a9..13e8e29a3 100644
--- a/src/core/hle/D3D8/Direct3D9/Direct3D9.h
+++ b/src/core/hle/D3D8/Direct3D9/Direct3D9.h
@@ -589,6 +589,14 @@ VOID WINAPI EMUPATCH(D3DDevice_SetIndices)
     X_D3DIndexBuffer   *pIndexData,
     UINT                BaseVertexIndex
 );
+
+// ******************************************************************
+// * patch: D3DDevice_SetIndices_4
+// ******************************************************************
+VOID WINAPI EMUPATCH(D3DDevice_SetIndices_4)
+(
+    UINT                BaseVertexIndex
+);
 
 // ******************************************************************
 // * patch: D3DDevice_SetTexture
@@ -1368,6 +1376,14 @@ VOID WINAPI EMUPATCH(D3DDevice_DrawVertices)
     X_D3DPRIMITIVETYPE  PrimitiveType,
     UINT                StartVertex,
     UINT                VertexCount
+);
+
+// ******************************************************************
+// * patch: D3DDevice_DrawVertices_4
+// ******************************************************************
+VOID WINAPI EMUPATCH(D3DDevice_DrawVertices_4)
+(
+    X_D3DPRIMITIVETYPE  PrimitiveType
 );
 
 // ******************************************************************
diff --git a/src/core/hle/Patches.cpp b/src/core/hle/Patches.cpp
index bc2b3b1e4..10e48a0a9 100644
--- a/src/core/hle/Patches.cpp
+++ b/src/core/hle/Patches.cpp
@@ -71,7 +71,8 @@ std::map<const std::string, const xbox_patch_t> g_PatchTable = {
 	PATCH_ENTRY("D3DDevice_DrawIndexedVerticesUP", XTL::EMUPATCH(D3DDevice_DrawIndexedVerticesUP), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_DrawRectPatch", XTL::EMUPATCH(D3DDevice_DrawRectPatch), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_DrawTriPatch", XTL::EMUPATCH(D3DDevice_DrawTriPatch), PATCH_HLE_D3D),
-	PATCH_ENTRY("D3DDevice_DrawVertices", XTL::EMUPATCH(D3DDevice_DrawVertices), PATCH_HLE_D3D),
+	PATCH_ENTRY("D3DDevice_DrawVertices", XTL::EMUPATCH(D3DDevice_DrawVertices), PATCH_HLE_D3D),
+    PATCH_ENTRY("D3DDevice_DrawVertices_4", XTL::EMUPATCH(D3DDevice_DrawVertices_4), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_DrawVerticesUP", XTL::EMUPATCH(D3DDevice_DrawVerticesUP), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_EnableOverlay", XTL::EMUPATCH(D3DDevice_EnableOverlay), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_End", XTL::EMUPATCH(D3DDevice_End), PATCH_HLE_D3D),
@@ -123,7 +124,8 @@ std::map<const std::string, const xbox_patch_t> g_PatchTable = {
 	PATCH_ENTRY("D3DDevice_SetFlickerFilter", XTL::EMUPATCH(D3DDevice_SetFlickerFilter), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_SetFlickerFilter_0", XTL::EMUPATCH(D3DDevice_SetFlickerFilter_0), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_SetGammaRamp", XTL::EMUPATCH(D3DDevice_SetGammaRamp), PATCH_HLE_D3D),
-	PATCH_ENTRY("D3DDevice_SetIndices", XTL::EMUPATCH(D3DDevice_SetIndices), PATCH_HLE_D3D),
+	PATCH_ENTRY("D3DDevice_SetIndices", XTL::EMUPATCH(D3DDevice_SetIndices), PATCH_HLE_D3D),
+    PATCH_ENTRY("D3DDevice_SetIndices_4", XTL::EMUPATCH(D3DDevice_SetIndices_4), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_SetLight", XTL::EMUPATCH(D3DDevice_SetLight), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_SetMaterial", XTL::EMUPATCH(D3DDevice_SetMaterial), PATCH_HLE_D3D),
 	PATCH_ENTRY("D3DDevice_SetModelView", XTL::EMUPATCH(D3DDevice_SetModelView), PATCH_HLE_D3D),