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Shared video memory?

post #1 of 7
Thread Starter 
Is it typical, and or good, to have shared video memory with a dedicated gfx card? Look at my sig, and notice I have a gtx 460, but certain tests say i have 2.5gb or video memory. obviously, this is system shared. is this slowing down my game performance, and should it be turned off it it can, or its it perfectly natural? Btw, my games are running rather slow for having 4 gb of ram.

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post #2 of 7
High-end video cards do not share main memory anymore.... they haven't for a decade. Only the lowest end cards might have that feature.

4GB of RAM has very little to do with game performance. If your CPU isn't overclocked, that is your issue.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
High-end video cards do not share main memory anymore.... they haven't for a decade. Only the lowest end cards might have that feature.

4GB of RAM has very little to do with game performance. If your CPU isn't overclocked, that is your issue.
well i saw a great leap in performance from 1gb to '4gb' and was wondering if maybe that coulb be taken father by getting rid of my gfx card's shared memory which has '2.5gb' of video memory. this usually happens in benchmarks...
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post #4 of 7
Quote:
Originally Posted by evoguyIX9 View Post
well i saw a great leap in performance from 1gb to '4gb' and was wondering if maybe that coulb be taken father by getting rid of my gfx card's shared memory which has '2.5gb' of video memory. this usually happens in benchmarks...
1GB is too little. Games can only really use up to 2GB anyways.

The latency of using main memory is too great so GPUs use dedicated memory.
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post #5 of 7
Performance tanks as soon as you run out of frame buffer and have to rely on system memory for graphics card duty since you have both the latency of the PCIe controller and the limited (comparative) bandwidth of the PCIe lanes.
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post #6 of 7
The 2.5GB you speak of having seen ... it's not because of 'shared' memory ... it's just a wrong reading.
    
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post #7 of 7
That's DX10's memory sharing by software, not the actual memory sharing as in integrated graphics. I don't think this feature is used that often if at all.
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