Sign in with
Sign up | Sign in
Your question

HELP please SLI system's performance is horible

Last response: in Systems
Share
September 14, 2010 8:53:53 AM

Hey guys I'm getting very frustrated. I have had a decent gaming computer since late 08 and decided to upgrade to a 2 way SLI setup to boost my frame rates about a week ago. After I upgraded to SLI I was shocked that there was little to no performance increase. So I'm hoping someone with more experiences than me with SLI can help me fix this or recommend an affordable upgrade option. I'll start by giving a detailed as possible description of the hardware and software I'm using relevant to my problem.

My Hardware
Corsair TX850 Model # CMPSU-850TX
Evga 780i motherboard. Model # 132-CK-NF78-A1
Intel Core2 Quad Processor Q6600 G0 stepping
Western Digital VelociRaptor 150GB 10,000rp Model # WD1500HLFS (OS drive)
Western Digital Caviar Black 1TB 7200 RPM SATA 3.0Gb/s 3.5" Model # WD1001FALS
OCZ DDR2 PC2-6400 Gold 8GB (4x2GB Modules) Part # OCZ2G8004GK
2x Evga GTX 285 at stock clock (with SLI bridge) Model # 01G-P3-1281-AR

My Software
Windows 7 Ultimate 64bit
Motherboard driver 15.53 nforce 64bit
Using Nvidia driver 258.96 win7-64bit
Evga precision tuner version 2.0.0
Cpu overclocked with bios (v.P10) to 3.21 Ghz (1.34v) FSB 1423 Mhz Memory at 5-5-5-15 at 851 Mhz (1.63v)

I hope this information is enough to help solve the problem I'm having. Let me know if you need more information.

I was considering upgrading my motherboard, processor, and memory to fully support my 2x GTX 285s but I would like to find what the bottle neck and or software problem is with my current system before I upgrade my hardware. Thanks again in advance for any support you can give me.
September 14, 2010 1:12:03 PM

What games do you play and at what resolution? Whats the difference in frame rates. At low resolution you may see little or no performance increase with sli where you will see an increase is in the higher resolutions and also In 3dmark Vantage. The system looks good I dont think it is any of your hardware, Your rig should play just about anything on highest settings. Post some frame rates and scores. [:bohleyk:1]
September 14, 2010 3:28:29 PM

I play at 1920x1200 resolution.

(Crysis) I got about 38-40 fps with 1 GTX 285 and when I upgraded too SLI with 2 285's, I was getting about 41-45.

I was under the impression that I would be getting at least a 10 fps gain from a second 285 if not more.

(BFBad Company 2) I get zero difference in fps I would say possibly 2 or 3 fps better but not much this is with settings on all medium 1920x1200 average 40-44 fps on 32 player mp matches.

From what I have seen posted in similar systems they get much better fps. So I would think I should be getting way better frame rates on the games I play (Bad Company 2\GTA 4\S.T.A.L.I.K.E.R.\Others) It just feels like if I took one card out I would get about the same performance. So I must be doing something wrong or I may have some hardware or software problem slowing me down.
Related resources
a b B Homebuilt system
September 14, 2010 4:18:56 PM

BFBC2 and GTA4 are very CPU dependent, its not going to stress even one 285 but will grind your CPU. Check the utilzation % on CPU and GPU while playing these games and see which is more stressed.

Crysis - are you playing with AA/AF on or off? Try turning it off and see if you get a good FPS boost. In Crysis I would expect you to see decent improvement, but AA/AF may cause a video RAM "bottleneck".

If you would, just for a quick check, try pulling 2 of your RAM sticks out and what effect only 4GB RAM has. Its possible you might increase FPS reducing the RAM.

Have you done thorough anti-virus/anti-spyware checks?
Also check for anything else running in the background (folding, torrents, etc)
September 14, 2010 4:32:50 PM

I'll give that a try with the ram. I think I heard something like that before about to much ram can slow performance/speeds.

on a side note I forgot to mention, I'm using the 3 way SLI bridge that came with my 780i motherboard. I had lost the 2 way bridge. I googled about using that and many people said it would make no difference as long as just the 2 cards are connected. but who knows they could be wrong.
September 14, 2010 4:49:12 PM

Im not sure about the bridge. Are you sure you enabled sli in the nvidia contol panel, I know its a stupid question, just making sure.
September 15, 2010 5:28:58 AM

I have triple checked all my software settings and everything is set as its supposed to be. I took 4 gigs of memory out and I did get a very small performance increase but not much to make a big difference. My goal is to run Bad Company 2 on max settings but the shadows and Hbao drop my frame rate by like 20 to 30 fps. Would getting a i7 with 2 gtx 285s allow me to make bad company? or should I sell my 2 gtx 285 and just get a 480?

Seems like after everything I have tried I'm not going to get much more performance out of my system.
a b B Homebuilt system
September 15, 2010 7:37:01 AM

I have a QX6700 running at 3.2GHz on that same 680i-type (Dell-branded EVGA lookalike) mobo. It came with 2x8800GTXs, and more often than not I got little to no gain running them SLI. In several games I actually experienced a decline in FPS when using SLI. I thought it was because SLI sucked, which it may well have back then.

In January the 8800GTXs were replaced with a 5870.

Sitting next to it is a second PC with an i5 750 running at 3.0GHz driving a 5770. The newer machine always gets more FPS at 1920x1200, often twice the FPS running WoW with both toons in the same location, displayed via different inputs on the same monitor.

IMO there is something wrong in there.
September 15, 2010 12:31:56 PM

Im not sure. You should try a 3dmark Vantage run with one card then both that will tell you if sli is working.
If I remember right I dont think I got a huge gain in Crysis when I upgraded to a second GTX 275 maybe 10-12fps. I dont play it a lot I just wanted to see if performance would be any better.
September 16, 2010 4:02:58 AM

Hey guys, thanks a bunch for all the tips and suggestions. I just got a bonus at work so I think I'm going to upgrade some parts on my system.
Let me know what you think of my choices for hardware.

1. Motherboard
EVGA 131-GT-E767-TR LGA 1366 Intel X58

2. Processor
Intel Core i7-875K Lynnfield (Plan to overclock, possibly waterblock)

3. Memory
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Model #: F3-12800CL9T-6GBNQ

Any of you guys out there that have a lot of experience with compatibility that could help me pick out a good combo of reliable components.
Preferably retailers/manufacturers with a good warranty, RMA, and work well with the other hardware please let me know your thoughts.

I plan on using my GTX 285's in 2 way SLI with the new hardware or possibly sell them and just get a single 480. Again let me know what you think. I can look at all the benchmarks and reviews I want but nothings like getting personal feed back and advice. Thanks again.
September 16, 2010 4:25:36 AM

The 875k is a 1156 socket chip you will need a P55 board.
If you want to go X58 (1366 socket) get the i7 950
September 16, 2010 4:28:40 AM

Depending on how much you want to spend I would just stick with the 285's they will perform just as good as 1 480 but they dont support Directx11. For me it would be a toss up.
September 16, 2010 4:42:45 AM

Here is a board and some memory for the i7 875k

MOBO: EVGA P55 FTW SLI
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Memory: G.SKILL Ripjaws Series 4GB (2 x 2GB)DDR3 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

For the i7 950

MOBO: EVGA E758-A1 3-Way SLI (x16/x16/x8) LGA 1366
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Memory: G.SKILL Ripjaws Series 6GB (3 x 2GB)DDR3 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
[:bohleyk:1]
September 16, 2010 5:40:22 AM

Great Info guys. Thanks so much. This money is burning a hole in my pocket!! I'm thinking if maybe I should wait for Q1 of next year for the new Intel and AMD chips. I haven't heard much about them but I'm guessing there going to be a good deal faster than the i7s. Also my system is good enough for now but I'm drooling over new hardware.

By the way I found out some interesting info about my GTX 285's. Let me know what you guys think about this.

One of my 285's BIOS version is 62.00.45.00.03 and the other is 62.00.45.00.80.

Not sure if that would be a problem and I don't wont to mess them up by flashing them. (never changed a bios on a video card before)

If you guys could give me some tips for flashing the cards to the same version would be of great help. I'll see what I can find online in the mean time.

Thanks again
a b B Homebuilt system
September 16, 2010 7:00:53 AM

Leave them alone, unless you know what was changed in the newer BIOS, and you suffer from that specific disease.
September 16, 2010 6:06:01 PM

dndhatcher said:
I would just get the EVGA P55 SLI.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Its $50 cheaper and effectively identical.


True the boards are Identical, the FTW has a few extra features, but the only Thing that I may/would use would be the pcie switch and the ECP contol panel everything else is pretty much useless. The EVGA P55 SLI is probably a better buy.

:cry:  I hate being wrong [:bohleyk:1]
September 17, 2010 12:23:02 AM

I just looked over a article about the p55 and x58 boards. It said that the p55's have a memory bandwidth problem for memory modals higher than 1066 mhz Du to the socket 1156. My first impression about this was not a big deal but got me thinking about down the line with upgrades being limited. I'm not stuck on the 875k so I could go with the 930 its on sale at a micro center for 200 bucks. The article could be full of rubbish but thought I would run it by you guys.
September 17, 2010 1:58:37 AM

First time I have heard of this. I have a Gigabyte p55-ud4p and an i7 860, I run Corsair Dominator 1600 without any problems. AS long as the motherboard is compatible with memory over 1066 then you shouldnt have any problems.
a b B Homebuilt system
September 17, 2010 4:11:48 PM

markusbrody said:
I just looked over a article about the p55 and x58 boards. It said that the p55's have a memory bandwidth problem for memory modals higher than 1066 mhz Du to the socket 1156.

Please link the article. Ive never heard such a thing.
!