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Question regarding Vram...

post #1 of 4
Thread Starter 
Hey guys , wonder if anyone can answer these few simple questions....


Say a PC game requires 550MB of Ram , and your GPU only has 512mb of ram , will you see a massive slowdown in performance?.....

Q2 : Say a game is using only 256mb of vram , but needs 80gigs/s of memory bandwidth and your gpu on has 70gigs/s , will you see a big slowdown too?.....


how can you tell if the game you are running needs more vram or memory bandwidth?


which would run slower , if you run out of vram , or you run out of memory bandwidth?


thanks for any answers a bit confused
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post #2 of 4
hmm, This is a tough question.

No game is going to need 80/gbps of bandwidth lol. Second of all if your GPU cant suply the ammount of ram needed for a game then it will lagg pretty bad and spudder everywhere. Then you just lower the resolution and it will use less. Also when overclocking the GPU it isnt hard to get an extra 10/gbps from the GPU.

Now if a game needs a certain amount of virtual ram say 256mb and you only have 128mb in your motherboard it will generaly use your hard drive to store data like it would your ram only way slower. Basicly thats why when you dont have enough ram to play a game you spuder and skip.
I hope I helped
Thats how it always seemed to me.

But anyway. Its not all about the Mem GBPS when using a GPU. Its kinda how the 8800GTS 512mb Keeps up with the 8800GTX and in some cases the ULtra. Its all about how they do it. Some cards can have much less GBPS than others it doesnt really mean much. Just like how ATI and Nvidia's pipelines and Memory speeds and bandwidths differ.
post #3 of 4
Thread Starter 
what will happen if a game requires more memory bandwidth than what is available? and how you know if your short of memory bandwidth or memory
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post #4 of 4
This all depends what the game has to load into the V RAM at any one time. It doesnt just plonk the whole game textures in there.

It loads progressively and changes depending on where you go and what you do in the game.

SLI helps with this because even though it doesn't combine the memory for both cards (damn), it gives the same work to two cards which in theory mean it gets rendered twice as fast ready for a new load of textures.

And unless there is a really massive difference in the memory being used and the memory you have, there is not much of a slowdown at all.
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