VRAM Usage - 6970 (2 GB) vs. GTX 580 (1,5 GB) vs. GTX 580 (3 GB)

[T}{OR]

Originally Posted by Hecke

Hey guys,

What is the max. amount of VRAM CloD uses atm if the GFX card has enough?
And what will give the most performance?
I will chose my GFX card according to this.

Does it use ...
> 2 GB or close to --> GTX 580 (3 GB)
> 1,5 GB or close to --> Ati 6970 (2 GB)
< 1,5 GB --> GTX 580 (1,5 GB)

There was only one guy I saw using a 3GB 580. And he is the only one capable of getting "40 FPS in the dreaded bombers-over-London mission" (settings on medium and high; 1920X1200 resolution). He says it runs silky smooth.

Here is the thread:

http://simhq.com/forum/ubbthreads.ph...3256483/1.html

The game will use up all available VRAM:



So, for me the choice is obvious.

Originally Posted by He111

The 6990 is a great card but with pathetic cooling, search Youtube, you won't be able to hear anything with the fan runnning. Wait for Gigabyte etc to release tri-fan 6990, Or better look at GTX 590 .

ok, 2 GPUS won't improve VRAM but doubling GPUS surely will

He111.

It won't. Not sure about CF and ATI cards, but with Nvidia and SLI even when you pair the two cards in SLI - you get the maximum amount of VRAM of a single card - it does not double up!

The common mistake nowadays is that dual GPU cards are the solution. They aren't. Dual GPU cards = CF or SLI "on a stick", with much worse cooling / loudness / chance to crap out on you.

[Kankkis]

If crossfire is supported i think it uses whole cf card memory, i have 5970 2mb

If it not supported it uses half, why even put 2gb if allways only half is used?

Kankkis

[T}{OR]

Originally Posted by Kankkis

If crossfire is supported i think it uses whole cf card memory, i have 5970 2mb

If it not supported it uses half, why even put 2gb if allways only half is used?

Kankkis

That 5970 doesn't help you a lot. Even when CF starts to become supported - you will still have 1GB of VRAM at your disposal. It will run "twice as fast" but you won't have twice as much of VRAM.

As if you're running 2 x 1GB cards. Their total amount is 2GB, but this accounts for speed only. You might as well have an Nvidia card with 1GB or VRAM right now.

This is why single GPU cards have the advantage here with CoD. 6970 2GB and 580 3GB are currently the best cards you can get for CoD.

[Slechtvalk]

Nah, I have seen picture from someone with a 5970 from the setup from ROF, he had 2 gig memory which he could use.

[adonys]

I don't know for sure, but dual GPU cards might have their memory shared (like in they both can access it all, so the data can be loaded through all memory, not separated for each GPU in its own memory). I need to check this.

yet, I would say do not buy no new hardware at least 1 month from now on. there's no point in doing it without knowing the engine's behavior after the few initial optimization patches.

[T}{OR]

Originally Posted by adonys

I don't know for sure, but dual GPU cards might have their memory shared (like in they both can access it all, so the data can be loaded through all memory, not separated for each GPU in its own memory). I need to check this.

I am certain that in SLI your memory doesn't double up.

Originally Posted by adonys

yet, I would say do not buy no new hardware at least 1 month from now on. there's no point in doing it without knowing the engine's behavior after the few initial optimization patches.

That is the best advice right there.

Originally Posted by T}{OR

There was only one guy I saw using a 3GB 580. And he is the only one capable of getting "40 FPS in the dreaded bombers-over-London mission" (settings on medium and high; 1920X1200 resolution). He says it runs silky smooth.

Here is the thread:

http://simhq.com/forum/ubbthreads.ph...3256483/1.html

The game will use up all available VRAM:



So, for me the choice is obvious.

That screen shows a GTX 460 and the game uses around 1GB maybe due to the 1GB GFX card. I should ask the 3GB guy to make such test.

[adonys]

that's exactly what i've asked on the other thread too: we really need someone with a single GPU card with 1.5/2/3 GB VRAM do an AIDA test on IL2 CoD on variou graphics settings.

[Buchon]

There a lot of confusion in this thread about how SLI/Crossfire work.

SLI/Crossfire cards and systems dont share VRAM between GPUs.

So the effective VRAM of a dual GPU with 2 GB is what is assigned to a one GPU.

That mean that in a dual GPU card with 2 GB of VRAM there a 1 GB of effective VRAM becouse, in fact this card are two single cards of 1 GB VRAM.

[adonys]

Originally Posted by Buchon

There a lot of confusion in this thread about how SLI/Crossfire work.

SLI/Crossfire cards and systems dont share VRAM between GPUs.

So the effective VRAM of a dual GPU with 2 GB is what is assigned to a one GPU.

That mean that in a dual GPU card with 2 GB of VRAM there a 1 GB of effective VRAM becouse, in fact this card are two single cards of 1 GB VRAM.

I was saying that DUAL GPU (590 GTX & 6990) cards might have their VRAM shared. We need to check the vendor's specifications for that.