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post #41 of 50
Quadfire y have too much money
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post #42 of 50
Quote:
Originally Posted by elitekills999 View Post
Quadfire y have too much money
lol... it actualy helps a lot at high res
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post #43 of 50
eskamobob1

You are right on processing units, polygons and data on VRAM. Also, expecting Quadfire of 4x scaling against a single card is like watching a movies from 1x speed to 2x or 1 hour movie speed up to 30 mins. Or playing games twice the speed of what you normally would. I am exaggerating a bit lol.
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post #44 of 50
Thread Starter 
Quote:
Originally Posted by eskamobob1 View Post
lol... prity much got it there... and actually not true about the nVidia VRAM... that was true on older cards, but im prity sure the 5xx series stacks VRAM... *snip* saw a 4-way eyefinity 6 5870 setup running a single 24 monitor block as one giant monitor once (though it was admitedly laggy)... if im wrong on any of this someone plz correct me... i dont want to give the OP false info, but i believe i am right atm
Yeah i heard that eyefinity does better with multi monitor set up, which was one the reasons i was interested in ati (although in the past i was not the biggest fan of ati i admit) so far though they seem to have some nice features that could be useful in the future and their price points are pretty reasonable
*snip*
Edited by DNytAftr - 11/7/11 at 7:17pm
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post #45 of 50
Not sure what this is about vram stacking, but afaik it doesn't stack. The vram is mirrored. You only have 2gb with which to address whatever resolution.

Anyways, here's a scaling test I did from way back.

Quote:
Originally Posted by tsm106 View Post
I did some runs with a 2600k and tfx vs qfx 6950s. Disclaimer, after win7 sp1 I lost a bit of performance so these runs won't be directly comparable to my i7 920 runs but we can still see the scaling between tfx and qfx.

Trifire



Quadfire

http://www.overclock.net/amd-ati/964...l#post13646444
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post #46 of 50
Quote:
Originally Posted by tsm106 View Post
Not sure what this is about vram stacking, but afaik it doesn't stack. The vram is mirrored. You only have 2gb with which to address whatever resolution.

Anyways, here's a scaling test I did from way back.

http://www.overclock.net/amd-ati/964...l#post13646444
thanks for the info ... there are certain tweaks that you can do to get VRAM to stack, but i thought it did naturally on ATI... so jc... would a 6990 and 2x 6970s perform better on massive 6 monitor spans because you get 4GBs of VRAM instead of just 2? and does anybody know why they wouldnt make VRAM stack? from what i can tell, it should be easily doable (it may just increase latency, so they dont)... some one plz explain

and +rep for info
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post #47 of 50
Quote:
Originally Posted by eskamobob1 View Post
thanks for the info ... there are certain tweaks that you can do to get VRAM to stack, but i thought it did naturally on ATI... so jc... would a 6990 and 2x 6970s perform better on massive 6 monitor spans because you get 4GBs of VRAM instead of just 2? and does anybody know why they wouldnt make VRAM stack? from what i can tell, it should be easily doable (it may just increase latency, so they dont)... some one plz explain

and +rep for info
Vram doesn't stack, either in AMD or Nvidia setups. The 6990 only has 2gb vram per gpu. Companies advertise 4gb total, but that obviously is misleading.

Per old arse Nvidia explanation, it's the same for AMD.

Quote:
The graphics memory is NOT doubled in SLI mode. If you have two 128MB graphics cards, you do NOT have an effective 256MB. Most of the games operate in AFR (alternate frame rendering). The first card renders one full frame and then the next card renders the next frame and so on. If you picture SLI working in this way it is easy to see that each frame only has 128MB of memory to work with.

If you feel you need 256MB or even 512MB of graphics memory for certain games, then you need to make sure that each card has that much memory. Also keep in mind that if you mix a 128MB GeForce 6600GT with a 256MB GeForce 6600GT that BOTH cards will operate with 128MB of graphics memory (the lowest common memory size of the two cards).
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post #48 of 50
Quote:
Originally Posted by tsm106 View Post
Vram doesn't stack, either in AMD or Nvidia setups. The 6990 only has 2gb vram per gpu. Companies advertise 4gb total, but that obviously is misleading.

Per old arse Nvidia explanation, it's the same for AMD.
thanks... makes more sence now ... but, JC... y dont they assign each monitor to a card? latency and matching issues? thats the only reason i can think of
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post #49 of 50
Quote:
Originally Posted by eskamobob1 View Post
thanks... makes more sence now ... but, JC... y dont they assign each monitor to a card? latency and matching issues? thats the only reason i can think of
That would be 3 more things that need to be synced, and then you'd have load balancing issues, and then if the cards were not all identical performers... woes and more woes... what do you then do with odd pairings, 2 screens 3 cards? 3 screens 2 cards?? One screen per gpu does not scale in the best manner and not just graphically but realistically for the end user.
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post #50 of 50
Quote:
Originally Posted by tsm106 View Post
That would be 3 more things that need to be synced, and then you'd have load balancing issues, and then if the cards were not all identical performers... woes and more woes... what do you then do with odd pairings, 2 screens 3 cards? 3 screens 2 cards?? One screen per gpu does not scale in the best manner and not just graphically but realistically for the end user.
lol... makes sense... thanks... i usually use multiple monitors as separate desktops (not one big combined one) so its just a different way of thinking
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