Mantle causing frame rate/lag problems with 2x7950's crossfire

[dmferrett]

I've not been on here for a very long time so sorry if this has been discussed to death already. I'm finding Mantle has significant frame drops and stability issues in BF4 (using 14.4 drivers). Im actually getting better performance using openGL. Does anyone else have any advice or understanding to get
1) Mantle working
2) What drivers are currently best for BF4

 

[dmferrett]

Is it just a driver issue then? I also heard AMD saying Manlte doesnt work correctly with cards with less than 4gb of Vram. Where can I get 14.7 rc3, didnt see it on AMD's website last night?

 

[dmferrett]

2x7950's@1150Mhz
open GL is 80-110fps
mantle is 30-100fps.

 

[dmferrett]

Out of interest, how do you run BF4 in OpenGL mode?
Last time i looked I only had the option of Mantle and DirectX.

Im not an expert but the direct X in battlefield is open GL. Maybe some else can clarify this?

 

[dmferrett]

OpenGL and DirectX (D3D) are different things.

OK I'll take that on board.

 

[dmferrett]

OP

Change the drivers to 14.6 or 14.7
Use DX11
Make sure ULPS is disabled
Framepacing on

Problem solved.

Hi Kaap,
Installled the latest drivers 14.7 and did all the above but after 5-10 mins in BF4 the frames drop in Mantle 24-110 fps. In D3D the lowest is around 80fps but its relatively constant. It looks like Matt is absolutely right about leakage. (I also read an article saying that AMD state 4gb is needed to geet the best out of Mantle!!!)