Sign in with
Sign up | Sign in
Your question

Is SLI worse than a Single GPU???

Last response: in Graphics & Displays
Share
January 2, 2007 3:34:05 PM

I was going through the interactive GPU charts at THG and was amazed to see that some times the SLI'd FPS's are lower than single graphics versions
The Chart at THG
I also saw this in other cards and other tests too..... So can anyone plz explain this to me???
Is having SLI a disadvantage????? Would come as a huge shock for people who have spent 250$ ++ for a second 7900GS....[/b]

More about : sli worse single gpu

January 2, 2007 3:56:24 PM

It depends on the game, resolution, and eye candy. Higher settings tend to prove SLI's worth, while low settings show it as tripping over its own power, the second card actually restricting the first.

Having said this, I would only recommend SLI for two high end cards, as an equal price paid for one higher end card as opposed to two midrange cards favors the single card performance wise. Think of SLI as a capability allowing a moderately high framerate to be sustained at high resolutions and AA/AF/HDR levels. The tech quickly loses its worth below that.

Look at games you'll play in the charts and then what res. and eye candy; determine for yourself whether SLI makes sense for you.
January 2, 2007 11:58:44 PM

While the VGA Charts do show strange results for some SLI setups, I have not experienced the problem.

Since trying out sli on my last two machines I can say that in nearly all cases there has been an improvement in gameplay and framerate for every game that I play even though I only run at 1280x1024 because of my monitor. It also helps with being able to run higher AA and AF levels.

While SLI does show it's true power in higher resolutions, it can still provide an increase in FPS at lower resolutions if one card cannot cope with the graphics load. That being said though, if your game is cpu limited, you will see a decrease in FPS because of the sli driver overhead.
Related resources
January 3, 2007 4:38:12 PM

Quote:
While the VGA Charts do show strange results for some SLI setups, I have not experienced the problem.

Since trying out sli on my last two machines I can say that in nearly all cases there has been an improvement in gameplay and framerate for every game that I play even though I only run at 1280x1024 because of my monitor. It also helps with being able to run higher AA and AF levels.

While SLI does show it's true power in higher resolutions, it can still provide an increase in FPS at lower resolutions if one card cannot cope with the graphics load. That being said though, if your game is cpu limited, you will see a decrease in FPS because of the sli driver overhead.


But the thing is that there is a drop in FPS of almost 20% compared to single cards.
The problem is with SLI the cost of a second VGA + s SLI compatible Mobo + SLI compatible PSU .... will it justify the slight increase in FPS's???? or will the money be well spent on a single VGA more powerfull.
January 3, 2007 4:58:11 PM

I really depends on the game. Older games like AOE3 and even Empire at War don't do so well with SLI. Why? I'm not exactly sure. But what I can say is that newer games do take advantage of SLI, esp. in higher resolutions.
January 4, 2007 6:55:46 AM

Quote:
i have a question for you. WHY THE HELL ARE YOU ASKING A QUESTION WHICH HAS BEEN ANSWERED A HUNDRED MILLION TIMES SINCE THE TECH WAS RELEASED.

seriously people like you need shot for being lazy or at least fed to lions.


sorry Grand master... you are right...but the question still puzzles me, even after so many questions been asked and so many amswers been given...still people fall for the trap of SLI...it's really a marketing gimmick isnt it??? many of us will not even see any benefit from using SLI and the cost far outweighs the benefit...as I understand.
Anyway thousand appologies
January 4, 2007 7:21:21 AM

Bad day, eh?
January 4, 2007 12:20:06 PM

Quote:
i have a question for you. WHY THE HELL ARE YOU ASKING A QUESTION WHICH HAS BEEN ANSWERED A HUNDRED MILLION TIMES SINCE THE TECH WAS RELEASED.

seriously people like you need shot for being lazy or at least fed to lions.

What happened now? Tell us, nothing to be ashamed off :lol: 

Anyway, SLI performance depends on the game, resolution, and the settings. If the res is high, and all settings are maxed, SLI should improve framerates, but it is still inconsistent, so relusts are sometime "weird".

I wouldn't recommend SLI or Crossfire under 1600x1200 resolution.
January 4, 2007 2:00:33 PM

Quote:
i have a question for you. WHY THE HELL ARE YOU ASKING A QUESTION WHICH HAS BEEN ANSWERED A HUNDRED MILLION TIMES SINCE THE TECH WAS RELEASED.

seriously people like you need shot for being lazy or at least fed to lions.

What happened now? Tell us, nothing to be ashamed off :lol: 

Anyway, SLI performance depends on the game, resolution, and the settings. If the res is high, and all settings are maxed, SLI should improve framerates, but it is still inconsistent, so relusts are sometime "weird".

I wouldn't recommend SLI or Crossfire under 1600x1200 resolution.

thanks prozac....thats was a gr8 answer. And thaks to everyone else too for sharing your valuable points of view....
January 4, 2007 8:37:11 PM

Howdy,

I've been running my 6800 Gts in SLI for about a month now, and went through all this before getting this used gaming rig (thanks again for all those that helped me out). The charts on THG I don't think are correct. I can personally account for the CS:S. My FPS skyrocketed with the second card. But like all previous posts, the real difference was at 1600x1200 for me (which is what I like). I did see a nice improvement in 1280x960, but not near as much as 16x12.

My initial feelings so far on the SLI are somewhat mixed. I love playing my CS:S maxed out with crazy FPS, but there are some times when it's a pain. Company of Heroes is a perfect example. Out of the box, worked worse with SLI on. Patched it and made it work...then latest patch has REALLY made a big difference. So SLI folks just have to be patient sometimes is what I gather. And this maybe realated to the inaccurate VGA charts. New drivers after the results were taken probably has a LOT to do with it.

Doody
January 4, 2007 10:01:15 PM

See you not the err of your ways?

Everything is a marketing gimmick... everything.

Name 5 things that have really changed the way you live in your lifetime. Try. There's only 3 things for me:

Cell Phone
Internet
Internet Porn

All the other shi*t in the world is basically the same since the day I was born (1980). People have been doing spreadsheets on computers since the 70's. Same w/ word processing. Only thing really new to the office is email/internet.

Those older than I can probably add "computer" to the list and maybe "cable/satellite television." But there's not much else to add.

The more things change the more they stay the same.[/i]
January 4, 2007 11:10:09 PM

Quote:

Cell Phone
Internet
Internet Porn


Amen to that and an extra amen to that third one :wink:. Although I have none because I'm too young...
a b U Graphics card
January 4, 2007 11:29:34 PM

Quote:
Internet Porn


:lol:  :lol: 
a b U Graphics card
January 4, 2007 11:31:41 PM

i have ran sli and the only difference i have noticed (at 10x7 res.)
is that i can max the settings on games.

f.s. isnt suppose to utilize sli but it does play smoother. :?
!