Overclock.net › Forums › Graphics Cards › NVIDIA › NVIDIA Drivers and Overclocking Software › GTX660ti SLI issues, Mixed brands retaining core clocks and not playing nice.
New Posts  All Forums:Forum Nav:

GTX660ti SLI issues, Mixed brands retaining core clocks and not playing nice.

post #1 of 20
Thread Starter 
Hey guys, I'm Running into some SLI issues I have never run into before the 600 series, and hope some of you could take some time to tell me what you think.



So right after the GTX660ti's came out I did some research, and figured the best card for me to buy was a Zotac AMP! model, as it preformed well in benchmarks. More recently, I have been wanting more power so I bought a used PNY stock GTX660ti for a good price. Being familiar with SLI, I knew that the higher end card *SHOULD* underclock to meet the stock card for SLI, and then together could overclock at matching levels.

After installing the second card and enabling SLI, I noticed no FPS gain on BF3. MSI afterburner showed that with SLI enabled, the load was equally distributed as it should @ 40-60% each card, but no FPS gain was had in Identical environments with V-synch off. Then, with SLI-disabled, Load was put on a single card at 99% usage

Made sure to do the obligitory: Safemode>driversweeper>re-install. After that made no difference, I made a complete new install of windows- met with the same results.

Looking at GPU-z each card is retaining it's core clocks, The zotac@1006mhz boost and the PNY@980mhz boost. I have never seen this before with mixed brand cards.

I did several tests to Prove the following:

*That the used PNY card works 100% on it's own.
*That the core clocks were indeed different during usage
*That Both x16bit PCI lanes work and SLI is fully funtional
*SLI has no Effect on game Performance with mixed brands.

First I removed the functional Zotac card, and tested the PNY card on both PCI lanes. The card pushed through Furmark and Farcry2 bench just as the zotac had,with marginal differences.

I ran the PNY card on Furmark@ stock for 29 fps avg. then with a minor overclock for 31 fps avg.
Satisfied with this, I rebooted and enabled SLI and got a whopping 58 avg. FPS first run, and then 61avg. when applying the same minor OC.
Here is a pic of those results http://i.imgur.com/HZKigh.png

My celebrations were shortlived however when I ran Farcry2 bench again, and noticed no difference in the scene.
I ran 3 tests both with SLI-enabled and SLI-disabled, and saw the avg FPS lay between 85-95 in both cases.
Here is a Pic showing performance changes http://i.imgur.com/Dp9bDh.png
And here a pic showing the Differant core clocks during the test. http://i.imgur.com/HJofw.png

To push it home and show practical application, Here is a screen shot of afterburner showing Clear load distribution between both GPU's, and the heavier load when Only using the single GPU. In both instances I got 50-110 fps settling around 70 avg. http://i.imgur.com/6Aesyh.png


This is really bothering me and I'm at my wits end. Does anyone have any advice or theories?

I really appreciate you taking the time to read, I tried to keep it as thin as possible, yet still ended up with a wall of text. Thanks!!
post #2 of 20
CPU bottleneck. You need a overclocked i5 or i7 to run more then one card efficiently. For your CPU the highest GPU I would go for 2 cards would be the 7770 and even so you would need your cpu overclocked to 4.8ghz.
Red Dragon
(19 items)
 
HTPC
(20 items)
 
HomeServer
(13 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7 2600K @4.8ghz Asrock p67 Extreme4 GTX1080 G.SKILL Ripjaws X Series 16GB 9-11-11-31 2133MHz 
Hard DriveHard DriveHard DriveHard Drive
3x 640 WD blacks Raid 0 Mushkin Enhanced Reactor 512GB SSD Sandisk 1TB SSD Samsung 470 Series 128GB SSD 
CoolingOSMonitorKeyboard
XSPC Raystorm Windows 10 64bit Microboard m340clz 100hz 3440x1440 Corsair K70 
PowerCaseMouseAudio
TX850 HAF922 Logitech G502 Creative Sound Blaster Z  
AudioAudioAudio
Elac B6 & Dayton Audio SUB-800 Yamaha HTR-5790 Audio Technica ATH-A700 headphones 
CPUMotherboardGraphicsRAM
Q9550 @ 4GHZ Gigabyte EP45 UD3P GTX470 4GB OCZ Reaper 1150mhz 
Hard DriveHard DriveOptical DriveCooling
Western Digital Blue 500gb OCZ Vertex 2 60GB LG Bluray Corsair H50 
OSKeyboardPowerCase
Windows 7 Home Premium  Logitech K400 Corsair CX500 nMEDIAPC 6000B 
AudioOtherOtherOther
Yamaha HTR-5063 PS3 80GB BC PS3 with 250GB hard drive. Polk Audio Monitor 60s Bi-AMP Front Polk Audio Monitor 30s Rear 
OtherOther
Polk Audio CS1 Center Polk Audio PSW10 
CPUMotherboardGraphicsRAM
Xeon Harpertown 3.6ghz Asus P5Q SE/R HD7770 4GB DDR2 800mhz Corsair 
Hard DriveHard DriveHard DriveHard Drive
5TB Toshiba 5TB Toshiba 5TB Toshiba 2TB Hitachi 
Hard DriveHard DriveHard DriveOS
2TB Seagate 2TB Western Digital 1TB Hitachi Windows Home Server 2011 
Power
Corsair CX500 
  hide details  
Reply
Red Dragon
(19 items)
 
HTPC
(20 items)
 
HomeServer
(13 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7 2600K @4.8ghz Asrock p67 Extreme4 GTX1080 G.SKILL Ripjaws X Series 16GB 9-11-11-31 2133MHz 
Hard DriveHard DriveHard DriveHard Drive
3x 640 WD blacks Raid 0 Mushkin Enhanced Reactor 512GB SSD Sandisk 1TB SSD Samsung 470 Series 128GB SSD 
CoolingOSMonitorKeyboard
XSPC Raystorm Windows 10 64bit Microboard m340clz 100hz 3440x1440 Corsair K70 
PowerCaseMouseAudio
TX850 HAF922 Logitech G502 Creative Sound Blaster Z  
AudioAudioAudio
Elac B6 & Dayton Audio SUB-800 Yamaha HTR-5790 Audio Technica ATH-A700 headphones 
CPUMotherboardGraphicsRAM
Q9550 @ 4GHZ Gigabyte EP45 UD3P GTX470 4GB OCZ Reaper 1150mhz 
Hard DriveHard DriveOptical DriveCooling
Western Digital Blue 500gb OCZ Vertex 2 60GB LG Bluray Corsair H50 
OSKeyboardPowerCase
Windows 7 Home Premium  Logitech K400 Corsair CX500 nMEDIAPC 6000B 
AudioOtherOtherOther
Yamaha HTR-5063 PS3 80GB BC PS3 with 250GB hard drive. Polk Audio Monitor 60s Bi-AMP Front Polk Audio Monitor 30s Rear 
OtherOther
Polk Audio CS1 Center Polk Audio PSW10 
CPUMotherboardGraphicsRAM
Xeon Harpertown 3.6ghz Asus P5Q SE/R HD7770 4GB DDR2 800mhz Corsair 
Hard DriveHard DriveHard DriveHard Drive
5TB Toshiba 5TB Toshiba 5TB Toshiba 2TB Hitachi 
Hard DriveHard DriveHard DriveOS
2TB Seagate 2TB Western Digital 1TB Hitachi Windows Home Server 2011 
Power
Corsair CX500 
  hide details  
Reply
post #3 of 20
Thread Starter 
I am unsatisfied with that answer. an overclocked FX-8120 can easily handle SLI GTX-680s. I ran dual GTX560ti Absolutly fine @ 4.2Ghz Cpu clock. A good friend of mine runs 3 GTX580's On a V-formula board with an fx8150 at only 3.8. There has to be something more to this.
post #4 of 20
Quote:
Originally Posted by Dnoces View Post

I am unsatisfied with that answer. an overclocked FX-8120 can easily handle SLI GTX-680s. I ran dual GTX560ti Absolutly fine @ 4.2Ghz Cpu clock. A good friend of mine runs 3 GTX580's On a V-formula board with an fx8150 at only 3.8. There has to be something more to this.

Well considering that a Phenom II @4ghz will still bottleneck a single 7970 then I would say no matter what you do its a bottleneck. You would need your fx8120 oced to 4.8ghz to even get close to the IPC performance of a phenom II at 4.2ghz. Wait for piledriver to drop and upgrade, it should bring much needed improvements that will help your cards scale better.

I personally went though the same thing almost 2 years ago with my q9550 and my gtx470's. Bulldozer is pretty weak at single thread operations, biggest reason why its so weak for games. Personalty you would be better off with a i3 when it comes to gaming for this vary reason. A i3 3220 would no doubt scale toughs cards better in multi gpu situation.
Red Dragon
(19 items)
 
HTPC
(20 items)
 
HomeServer
(13 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7 2600K @4.8ghz Asrock p67 Extreme4 GTX1080 G.SKILL Ripjaws X Series 16GB 9-11-11-31 2133MHz 
Hard DriveHard DriveHard DriveHard Drive
3x 640 WD blacks Raid 0 Mushkin Enhanced Reactor 512GB SSD Sandisk 1TB SSD Samsung 470 Series 128GB SSD 
CoolingOSMonitorKeyboard
XSPC Raystorm Windows 10 64bit Microboard m340clz 100hz 3440x1440 Corsair K70 
PowerCaseMouseAudio
TX850 HAF922 Logitech G502 Creative Sound Blaster Z  
AudioAudioAudio
Elac B6 & Dayton Audio SUB-800 Yamaha HTR-5790 Audio Technica ATH-A700 headphones 
CPUMotherboardGraphicsRAM
Q9550 @ 4GHZ Gigabyte EP45 UD3P GTX470 4GB OCZ Reaper 1150mhz 
Hard DriveHard DriveOptical DriveCooling
Western Digital Blue 500gb OCZ Vertex 2 60GB LG Bluray Corsair H50 
OSKeyboardPowerCase
Windows 7 Home Premium  Logitech K400 Corsair CX500 nMEDIAPC 6000B 
AudioOtherOtherOther
Yamaha HTR-5063 PS3 80GB BC PS3 with 250GB hard drive. Polk Audio Monitor 60s Bi-AMP Front Polk Audio Monitor 30s Rear 
OtherOther
Polk Audio CS1 Center Polk Audio PSW10 
CPUMotherboardGraphicsRAM
Xeon Harpertown 3.6ghz Asus P5Q SE/R HD7770 4GB DDR2 800mhz Corsair 
Hard DriveHard DriveHard DriveHard Drive
5TB Toshiba 5TB Toshiba 5TB Toshiba 2TB Hitachi 
Hard DriveHard DriveHard DriveOS
2TB Seagate 2TB Western Digital 1TB Hitachi Windows Home Server 2011 
Power
Corsair CX500 
  hide details  
Reply
Red Dragon
(19 items)
 
HTPC
(20 items)
 
HomeServer
(13 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7 2600K @4.8ghz Asrock p67 Extreme4 GTX1080 G.SKILL Ripjaws X Series 16GB 9-11-11-31 2133MHz 
Hard DriveHard DriveHard DriveHard Drive
3x 640 WD blacks Raid 0 Mushkin Enhanced Reactor 512GB SSD Sandisk 1TB SSD Samsung 470 Series 128GB SSD 
CoolingOSMonitorKeyboard
XSPC Raystorm Windows 10 64bit Microboard m340clz 100hz 3440x1440 Corsair K70 
PowerCaseMouseAudio
TX850 HAF922 Logitech G502 Creative Sound Blaster Z  
AudioAudioAudio
Elac B6 & Dayton Audio SUB-800 Yamaha HTR-5790 Audio Technica ATH-A700 headphones 
CPUMotherboardGraphicsRAM
Q9550 @ 4GHZ Gigabyte EP45 UD3P GTX470 4GB OCZ Reaper 1150mhz 
Hard DriveHard DriveOptical DriveCooling
Western Digital Blue 500gb OCZ Vertex 2 60GB LG Bluray Corsair H50 
OSKeyboardPowerCase
Windows 7 Home Premium  Logitech K400 Corsair CX500 nMEDIAPC 6000B 
AudioOtherOtherOther
Yamaha HTR-5063 PS3 80GB BC PS3 with 250GB hard drive. Polk Audio Monitor 60s Bi-AMP Front Polk Audio Monitor 30s Rear 
OtherOther
Polk Audio CS1 Center Polk Audio PSW10 
CPUMotherboardGraphicsRAM
Xeon Harpertown 3.6ghz Asus P5Q SE/R HD7770 4GB DDR2 800mhz Corsair 
Hard DriveHard DriveHard DriveHard Drive
5TB Toshiba 5TB Toshiba 5TB Toshiba 2TB Hitachi 
Hard DriveHard DriveHard DriveOS
2TB Seagate 2TB Western Digital 1TB Hitachi Windows Home Server 2011 
Power
Corsair CX500 
  hide details  
Reply
post #5 of 20
Just commenting this: "More recently, I have been wanting more power so I bought a used PNY stock GTX660ti for a good price. Being familiar with SLI, I knew that the higher end card *SHOULD* underclock to meet the stock card for SLI, and then together could overclock at matching levels."

No nVidia drivers have since late 2008 or so supported cards running at their individual clock speeds - there's no "down-clocking" to match the slowest card anymore. The same goes for CrossFire.
Polar Claw
(19 items)
 
Arkbird
(15 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7 6900K 3.2@4.0GHz MSI X99S SLI Krait Edition 2x Zotac GTX 1080TI F.E SLI @2000/5872MHz 32GB HyperX Savage 2666MHz DDR4 CL13 
Hard DriveHard DriveHard DriveHard Drive
Intel SSD 330 Series 120G SSD Kingston SSD Now V300 240GB SSD Kingston V-series Gen2 64GB SSD  Samsung SpinPoint F1 640GB 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda 7200.12 750GB Samsung SH-S203D DVD-Rom Phanteks PH TC-12DX Black Windows 10 Home Premium 64bit  
MonitorKeyboardPowerCase
Asus PB278Q 27" TFT 2560x1440@60Hz 5ms  Microsoft Sidewinder X6 Thermaltake Toughpower 1500w Corsair Vengeance C70 Artic White 
MouseMouse PadAudio
Logitech G9X Steelseries Steelpad 4D Onboard Realtek HD 
CPUMotherboardGraphicsRAM
Intel Core i7 5960X 3.0@4.1GHz MSI X99S Gaming 7 2x EVGA GTX 1080 SC ACX 3.0 SLi @2000/5508MHz 32GB (4x8GB) Corsair Vengeance LPX 2666MHz CL15... 
Hard DriveHard DriveOptical DriveCooling
Kingston V300 120GB SSD Western Digital Black 500GB, 7200RPM, 8MB cache... ASUS DRW 24F1ST DVD±RW  Arctic Liquid Freezer 120 
OSMonitorKeyboardPower
Windows 10 Home Premium 64Bit AOC Q3279VWF 31.5" TFT, 2560x1440@75Hz 5ms Kingston HyperX Alloy FPS Fractal Design Newton R3 1000watt 80+ Platinum ... 
CaseMouseAudio
Aerocool XPredator X3 White Logitech G5 Star Wars edition  Logitech X210 2.1 speakers 
  hide details  
Reply
Polar Claw
(19 items)
 
Arkbird
(15 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7 6900K 3.2@4.0GHz MSI X99S SLI Krait Edition 2x Zotac GTX 1080TI F.E SLI @2000/5872MHz 32GB HyperX Savage 2666MHz DDR4 CL13 
Hard DriveHard DriveHard DriveHard Drive
Intel SSD 330 Series 120G SSD Kingston SSD Now V300 240GB SSD Kingston V-series Gen2 64GB SSD  Samsung SpinPoint F1 640GB 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda 7200.12 750GB Samsung SH-S203D DVD-Rom Phanteks PH TC-12DX Black Windows 10 Home Premium 64bit  
MonitorKeyboardPowerCase
Asus PB278Q 27" TFT 2560x1440@60Hz 5ms  Microsoft Sidewinder X6 Thermaltake Toughpower 1500w Corsair Vengeance C70 Artic White 
MouseMouse PadAudio
Logitech G9X Steelseries Steelpad 4D Onboard Realtek HD 
CPUMotherboardGraphicsRAM
Intel Core i7 5960X 3.0@4.1GHz MSI X99S Gaming 7 2x EVGA GTX 1080 SC ACX 3.0 SLi @2000/5508MHz 32GB (4x8GB) Corsair Vengeance LPX 2666MHz CL15... 
Hard DriveHard DriveOptical DriveCooling
Kingston V300 120GB SSD Western Digital Black 500GB, 7200RPM, 8MB cache... ASUS DRW 24F1ST DVD±RW  Arctic Liquid Freezer 120 
OSMonitorKeyboardPower
Windows 10 Home Premium 64Bit AOC Q3279VWF 31.5" TFT, 2560x1440@75Hz 5ms Kingston HyperX Alloy FPS Fractal Design Newton R3 1000watt 80+ Platinum ... 
CaseMouseAudio
Aerocool XPredator X3 White Logitech G5 Star Wars edition  Logitech X210 2.1 speakers 
  hide details  
Reply
post #6 of 20
What's your CPU usage look like? That would be the first place I'd look for a problem. Also make sure you are using the latest bios for your motherboard. I remember reading recently that there was some significant update for bulldozer.
post #7 of 20
Thread Starter 
Im overclocked to 4.6ghz, and my usage never goes over 90%, i rest around 60-80 for BF3. I really don't think I'm being bottlenecked, but Im no expert. No matter what I'm getting a 8350 when they come out later this month to replace my 8120, but this thing has a strong enough arm to handle these in 2-way SLI for sure....
post #8 of 20
Quote:
Originally Posted by Dnoces View Post

Im overclocked to 4.6ghz, and my usage never goes over 90%, i rest around 60-80 for BF3. I really don't think I'm being bottlenecked, but Im no expert. No matter what I'm getting a 8350 when they come out later this month to replace my 8120, but this thing has a strong enough arm to handle these in 2-way SLI for sure....
When running them in sli check each core on the cpu. You may have one or two cores maxed out, but the overall cpu usage isn't at 100%.
post #9 of 20
Quote:
Originally Posted by d-block View Post

When running them in sli check each core on the cpu. You may have one or two cores maxed out, but the overall cpu usage isn't at 100%.

This sounds like the best bet, if two of your cores are at 100% you are bottlenecked. Check and post results.
    
CPUMotherboardGraphicsRAM
i5-6600K Gigabyte GA-Z170X-Gaming 5 Gigabyte 980 Ti Corsair Vengeance LPX 16GB (2x8GB) DDR4 3200MHz  
Hard DriveCoolingOSKeyboard
Samsung 840 EVO 250gb Swiftech H240-X  Win10 Pro Logitech K830 
PowerCaseOther
EVGA Supernova 1000w G2 Phanteks Enthoo Evolv ATX Tempered Glass EK Titan X / 980 Ti Full Cover Waterblock  
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i5-6600K Gigabyte GA-Z170X-Gaming 5 Gigabyte 980 Ti Corsair Vengeance LPX 16GB (2x8GB) DDR4 3200MHz  
Hard DriveCoolingOSKeyboard
Samsung 840 EVO 250gb Swiftech H240-X  Win10 Pro Logitech K830 
PowerCaseOther
EVGA Supernova 1000w G2 Phanteks Enthoo Evolv ATX Tempered Glass EK Titan X / 980 Ti Full Cover Waterblock  
  hide details  
Reply
post #10 of 20
Thread Starter 
Hope you can see that, if not I'll up load from imgur. As you can see, I quickly jumped into a game in metro, ran past a roaring B and got a nice 5 kill streak, then closed the game.

Cpu never goes past 80% the entire time, and both GPU's split load but never go over 80FPS.
New Posts  All Forums:Forum Nav:
  Return Home
Overclock.net › Forums › Graphics Cards › NVIDIA › NVIDIA Drivers and Overclocking Software › GTX660ti SLI issues, Mixed brands retaining core clocks and not playing nice.