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Flashed a 2gb bios on my 1gb gt 640

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So I was bummed that my gt 640 wouldnt work as a physx card with batman arkham night. So I figured I would mess with it a little and see what I needed to make it work. Since its a gk107 gpu, there is no bios modding tool for it. So I started looking at different bios's with different clocks. I figured why not I dont use it much anymore. Lets see how high i could max the core clocks too. So in the process I accidentally flashed a 2gb bios on it. Funny thing is it works and whats even stranger, it now works as a dedicated physx card in Arkham Night.

So do I need to worry? I actually extremely happy right now cause as a dedicated physx card on batman, it does wonders for my fps. Im still using my old 660ti for my primary.

gpu-z shows my card as a 2gb card now. Im a little confused, so does it really have 2gb?
 

Chloefile

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Maybe it was originally a 2GB card, but with a 1GB bios, like those Radeon RX480 4GB's which are 8GB cards in reality, but have just a 4GB bios on them?
 
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So I was bummed that my gt 640 wouldnt work as a physx card with batman arkham night. So I figured I would mess with it a little and see what I needed to make it work. Since its a gk107 gpu, there is no bios modding tool for it. So I started looking at different bios's with different clocks. I figured why not I dont use it much anymore. Lets see how high i could max the core clocks too. So in the process I accidentally flashed a 2gb bios on it. Funny thing is it works and whats even stranger, it now works as a dedicated physx card in Arkham Night.

So do I need to worry? I actually extremely happy right now cause as a dedicated physx card on batman, it does wonders for my fps. Im still using my old 660ti for my primary.

gpu-z shows my card as a 2gb card now. Im a little confused, so does it really have 2gb?


The weird thing is that the 640 is fully supported by Physx... or it was a couple of years ago when I had mine so maybe your original bios had a problem with the device ID or something.

Is not that weird that the 2GB bios would work, only issue would be that when the memory requirement goes over 1GB the card will likely crash. As a Physx card that shouldn't happen however. Enjoy.
 
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I flashed 580 bios on a 480... card was all out of whack, performed worse at stock clocks too, no increase in shaders.
 

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Iv done this when using my eeprom flasher. The card works great but some programs or games will read it as 2GB as well, however because of this it will attempt to load data that has nowhere to go physically. I have seen all sorts of odd issues ranging from artifacts to crashes to BSODs because of this. I wouldnt leave it like that.
 
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so I was using gpupi and it made it crash. so it doesnt really have 2gb of ram. Looks like the new physx requires 2gb of ram. I used a few different 2gb bioses and they all worked but all 1gb bios disable physx in Arkham Knight.

So on a side note, as it works in arkham knight and gives me a pretty good boost. My gpu usage in my 660ti dropped to around 70-80% average. I think it actually hold my 660ti back now, a better physx card would help my fps dramatically.

I have a gtx 970 coming so I should be able to use my 660ti as a physx card now which should be overkill.
 
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