2x 7950GT or 1x 8-series?

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charlesviper

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Oct 14, 2007
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Hey all,

I've currently got a second-hand 7950GT which had a voltage inductor break off, meaning I'm going to have to restructure the fans [they will no longer work on the card itself]. This came at a time where I've been overclocking, trying to decrease temperatures, etc.

I'm wondering if, for performance in DX9 games, two 256MB LeadTek 7950GTs in SLi would beat a single 8800GT / 8800GTS / 8800GTX?

I don't have Vista and I don't play DX10 games...yet. For the time being, would paying for a 7950GT at half the price of an 8800GTX and running the two cards in SLi give me a performance advantage?

I could then wait until prices fall on a 8800GTX.

Charles
 

crjdriver

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I am no fan of sli; to me the tech is just a gimmick to sell more cards. Go with the single 8800gts or if you can afford it, the 8800gtx card.

FWIW sli is not new technology. It has been around since the late 90s. The voodoo line of cards had some with two gpus on a single card; one the 6000 [I think] had four gpus [with four fans] on one card :eek: :eek:
It was about the size of a small motherboard :eek:
 

charlesviper

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Oct 14, 2007
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Thanks for that tip. I was under the idea that since you can set the graphics cards to render every other frame [card one, card two, card one, card two, etc], you'd get exactly twice the performance. I guess it's not that simple...

I've fixed my 7950 GT, but I won't get another card until I can get an 8800GTX.
 

crjdriver

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That is the way sli is supposed to work however I doubt you would see more than a 20% real world improvement over the single card. The 8800xx series will give you better performance without the need for a larger pw supply for the two cards.

Two 7950s would most likely require a pw supply of around 550-600W with at least 35-40amp on the 12V rails.

Note you are going to need a high quality pw supply for the 8800 as well; just not quite as expensive of a one.
 

charlesviper

Thread Starter
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Oct 14, 2007
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18
Woah thanks for this useful information. Do you have any sources for SLi performance? Bar graphs and statistics and the like?
 

crjdriver

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I am sure there are some available. I built a system a while ago with one 7900 and another one was added later. It really did not make all that much of a difference in games, etc. A small improvement however nothing earth shaking.
 
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Oct 15, 2007
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What you can do is wait for the 8800gt which is supposed to be coming out next week (31st). Its supposed to be just slower than the ultra, but only about $250.

With sli, you can never get twice the performance. You will usually get an increase, but this depends on many things. I bought a board and psu that is sli ready, just in case I decided to go that route, but there can be problems to sort out before it is running smoothly. I'd prefer to buy a single card that performs well as opposed to buying 2 mediocre cards, sli them and still have performance that isn't close to a decent card. If it was a case where SLIing 2 cards would give you twice the performance, great, but buying 2 $800 cards for the slight increase in performance over the single $800 card is really far from a bargain.

I've got the 7950gt and I haven't had any complaints yet. I play almost all of my games with high settings and resolutions (if available) and rarely have slowdowns, which is very nice. I don't OC, just enough to optimize the speeds everything run at.
 
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