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Vram and ram question

Last response: in Graphics & Displays
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February 11, 2009 5:16:57 PM

i know my xfx hd 4850 has 512mb dedicated video ram on it, and when i use the "can you run it" online app it shows i have 3.2gb of video ram. now my pc has 6gb of ram so does that mean the gpu is using that ram to add to its own vram and it in return will help in games get a higher framerate? because in crysis/warhead i see absolutely no framerate change or loss when i enable 4xaa or even 8xaa (ok maybe 2 or 3 frames with 8xaa) is that because the gpu is adding the system ram? im really confused but i love that i have barely if any preformace loss with high levels of AA on and high graphical settings. so if someone could explain this that would be great and thanks.


More about : vram ram question

February 11, 2009 5:34:25 PM

I dunno how you loose only 2-3 frames only when you go to 8 AA?

http://www.bit-tech.net/hardware/graphics/2009/02/05/xf...

I mean the 4850 seems to loose frames when AA is enabled just like any card...


Far Cry 2
1,680 x 1,050 0xAA 0xAF, DirectX 10, High Detail (49.9 frames per second)


Far Cry 2
1,680 x 1,050 2xAA 0xAF, DirectX 10, High Detail (42.1 frames per second)


Far Cry 2
1,680 x 1,050 4xAA 0xAF, DirectX 10, High Detail (36.6 frames per second)

Seems like any other card when loosing frames to me, going from 0 AA to 4 AA was a 13 fps drop, which means a 36% drop. And far Cry 2 uses dx 10.1 which should;ve given Free AA to DX 10.1 cards...

When i had the 9800 GX2 and I enabled 2 or 4x's AA the card had some noticeable drops especially in intense areas.

As for adding more ram from the system, I think it starts to leech off the system when it runs out of resources on the laptop, not soo sure about the PC though, and when it starts leeching the experience is very poor anyways, especially if you have a slow system (not you, just in general).

Though I did remember that if your video card had a certain ram amount Vista in 32 bit before Service pack 1 would show you the 3.25 gigs - 512 megs (lets say the card had 512 megs) for some reason...or something like that. :p 
February 11, 2009 6:14:20 PM

well i run vista 64-bit (not gonna make the same mistake twice) but yeah i do get fps loss in intense areas of course but when little or not much is going on i dont see a huge loss going from 4xaa to 8xaa. my res is only 1360x768 on 26" hdtv so that i know is part of the reason i get high framerate because of a somewhat low res. and about the 9800GX2 that card is terrible with aa, i had one and played at the same res and it struggled with crysis and 2xaa, this 4850 blows the gx2 out of the water. ive recently found through experience that ati gpu's handle aa way better than nvidia gpu's do, they dont take as much of a preformance hit when enabled.
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February 11, 2009 6:26:54 PM

I still haven't seen it:)  you saw the benchies I've shown you. I mean from what I understand DX 10.1 was supposed to be free AA, but we don't have it yet:p 

I wouldn't say the 4850 blows the gx2 out of the water, I mean the 9800 GX2 is basically 2 underclocked 9800 GtXs lol, so I wouldn't say that. Both cards have DDR3 512 megs vram.

If 1 GPU was turned off the cards should be performing around the same, with the 4850 performing better in general.

http://www.bit-tech.net/hardware/graphics/2009/01/30/bf...

Look at 2560x1600 with out AA, the 4870 1 GIG Crossfire was first, follow by 280 GTX sli then the 4870 X2.

2560x1600 with 2AA, the 280 GTX sli pulls ahead, and by the time it reaches the 4AA mark, the 4870s are gone. Soo really this is why I don't put too much demand in AA, since cards can handle it differently.

If you look the 280 GTX sli suffered a 14% lose, while the 4870 1 GIG CF sli 60% loses and 4870 X2 56% lose.
a b U Graphics card
February 11, 2009 7:10:24 PM

Hey, the 9800GX2 does have its driver issues (glares at NVIDIA), but still is a great buy for 1600x1200 and below resolutions. I'm actually running at 1920x1200 for most games maxed (albiet, without AA for obvious reasons).
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