HD 4670 memory problem

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Johnnyred

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Feb 14, 2012
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I've had this HD 4670 (1GB) for a while now and it's never given me any problems that I can remember. However, when I did a dxdiag I noticed that it was only picking up 756 MB of vram.

Recently I upgraded my horrifically outdated computer to a more modern one. Along with that I've also upgraded from a 32-bit OS to 64-bit. In addition, the video card's driver was replaced with a 64-bit version.
One thing I've noticed is that Win 7 automatically installed DX11 and my video card only supports DX10. It's hard to tell if the lost memory has affected game performance (I've been playing games like Mass Effect 2, Skyrim, and Arma on a P4, so the I've only seen a drastic improvement over my old computer!).

I have three questions:
- Why is dxdiag only picking up 756MB of vram when the card really has 1GB?
- Is running a version of DirectX higher than your video card supports a bad thing?
- Should I be concerned with the loss of video memory and using an unsupported DirectX version?

My system specs are:
Core i7 930 @ 2.8 Ghz
Sapphire Radeon HD 4670 (1GB GDDR3)
8GB of RAM (Corsair Vengeance)
500GB HDD, Western Digital 7200rpm
Win 7 Ultimate 64-bit

Thanks in advance. :)
 
Solution
- Why is dxdiag only picking up 756MB of vram when the card really has 1GB?
The answer is here....
http://support.microsoft.com/kb/2026022

- Is running a version of DirectX higher than your video card supports a bad thing?
No, it just won't run it.... it will fallback to the highest version it supports. Your Dxdiag may report as the version installed is DX11, but that doesn't mean the DX9.0c or DX10 is not present in the rig.

- Should I be concerned with the loss of video memory and using an unsupported DirectX version?
Not in the least bit. Don't worry about it, it's not going to have an adverse effect on the actuals.... just cosmetic...

scout_03

Titan
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the card is made to support dx 10 so it wont use dx 11 upgrading for 64 is a gain use this to see exact memory on the 4670 http://www.techpowerup.com/gpuz/ and this one http://www.geeks3d.com/20120202/gpu-caps-viewer-1-15-0-opengl-opencl-cuda-graphics-card-utility/
 
- Why is dxdiag only picking up 756MB of vram when the card really has 1GB?
The answer is here....
http://support.microsoft.com/kb/2026022

- Is running a version of DirectX higher than your video card supports a bad thing?
No, it just won't run it.... it will fallback to the highest version it supports. Your Dxdiag may report as the version installed is DX11, but that doesn't mean the DX9.0c or DX10 is not present in the rig.

- Should I be concerned with the loss of video memory and using an unsupported DirectX version?
Not in the least bit. Don't worry about it, it's not going to have an adverse effect on the actuals.... just cosmetic...
 
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