Overclock.net › Forums › Graphics Cards › NVIDIA › OC'in SLI
New Posts  All Forums:Forum Nav:

OC'in SLI

post #1 of 8
Thread Starter 
Hi Im a complete beginner when it comes to OC'ing and just started on my gigabyte gtx460 1gb OC's a little. From what I understand I can only do it on the top card, or well, one card at a time.

I manage to get it to 820Mhz core, thats the limit on stock voltage for me, and the memory to 1035Mhz. This seems to be the absolute limit for the card, well atleast on 1v.

What Im sort of wondering is, If say I was to get the bottom card to 820+Mhz core or the memory higher then 1035Mhz, Im still gonna have to settle for the slowest card's overclock right?

Lets say I synchronize the 820Mhz etc. settings with MSI Afterburner and play games, which would be the only way to test stability, to some extent, on an SLI setup. And all seems well, Then effectively that is the highest SLI overclock for me on 1v, am I right?

I will ofc test my bottom card separately at some time, Im just at writing moment a bit lazy


Appreciate the help all you guys give and hope some day I can return the favour.


All the best!
First own build!
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 Rampage 3 Formula Gigabyte Geforce GTX 580 SOC Corsair 6GB DDR3 XMS3 PC12800 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD MLC + HD 7K1000.C 1TB Samsung DVD±R/RW/RAM DL 22X Windows 7 Home 64-bit BenQ E2220HD 22" 
KeyboardPowerCaseMouse
Sidewinder X4 Corsair HX 750W ATX12V 2.3 / EPS12V CM 690 II Advanced Intellimouse Explorer 3.0 
Mouse Pad
steelseries 
  hide details  
Reply
First own build!
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 Rampage 3 Formula Gigabyte Geforce GTX 580 SOC Corsair 6GB DDR3 XMS3 PC12800 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD MLC + HD 7K1000.C 1TB Samsung DVD±R/RW/RAM DL 22X Windows 7 Home 64-bit BenQ E2220HD 22" 
KeyboardPowerCaseMouse
Sidewinder X4 Corsair HX 750W ATX12V 2.3 / EPS12V CM 690 II Advanced Intellimouse Explorer 3.0 
Mouse Pad
steelseries 
  hide details  
Reply
post #2 of 8
Well I have 2 460's in sli a msi cylcone which is stock clocked 725mhz and a msi hawk at 780mhz stock. I was able to get 825mhz stock volt with them both in sli and can run 850mhz stable with a small vcore bump. But as far as i know the slower card will limit the oc.

*edit to clarify* Always set your cards the same clocks. If you decide to change voltages make sure that afterburner adjusts both. I had to go in and manually change my volts for each card because the voltage charts were different for the cards.
Edited by MURDoctrine - 10/6/11 at 7:37am
post #3 of 8
Quote:
Originally Posted by MURDoctrine View Post
*edit* Always set your cards the same. If you decide to change voltages make sure that afterburner adjusts both. I had to go in and manually change my volts for each card.
There's absolutely no reason you need to have both cards at the same voltage. My cards are different stock VIDs and work perfectly together. Overclocked or not.

Same clock speed, yes. Same voltage? No point.
Why upgrade?
(14 items)
 
Why overclock?!
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 760 ASUS 55i Sabertooth EVGA 960 4GB 8gb 1600mhz Vengeance 
Hard DriveHard DriveOSMonitor
120gb Intel 320 (OS) 500gb Samsung 850 Evo Win 7 64 Viewsonic VX2250-Wm 
PowerCaseMouseAudio
Seasonic G 550w Gold Lancool PC-K9B Logitech G5 X-Fi Titanium/AT-H700 
CPUMotherboardGraphicsRAM
Core i5 4690k Asus Z97 Sabertooth mk2 EVGA 970 8gb Kingston 1833mhz 
Hard DriveHard DriveCoolingOS
128GB Samsung 830 500GB Samsung 840 Evo allota fans but quiet! Win 7 64 
MonitorKeyboardPowerCase
Dell U2311H Rev. A01 Mechanical w/ Cherry Blues NZXT Hale 650w NZXT Phantom - white 
MouseMouse PadAudio
Anker CG100 Steelseries 9HD Sennheiser HD555 
  hide details  
Reply
Why upgrade?
(14 items)
 
Why overclock?!
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 760 ASUS 55i Sabertooth EVGA 960 4GB 8gb 1600mhz Vengeance 
Hard DriveHard DriveOSMonitor
120gb Intel 320 (OS) 500gb Samsung 850 Evo Win 7 64 Viewsonic VX2250-Wm 
PowerCaseMouseAudio
Seasonic G 550w Gold Lancool PC-K9B Logitech G5 X-Fi Titanium/AT-H700 
CPUMotherboardGraphicsRAM
Core i5 4690k Asus Z97 Sabertooth mk2 EVGA 970 8gb Kingston 1833mhz 
Hard DriveHard DriveCoolingOS
128GB Samsung 830 500GB Samsung 840 Evo allota fans but quiet! Win 7 64 
MonitorKeyboardPowerCase
Dell U2311H Rev. A01 Mechanical w/ Cherry Blues NZXT Hale 650w NZXT Phantom - white 
MouseMouse PadAudio
Anker CG100 Steelseries 9HD Sennheiser HD555 
  hide details  
Reply
post #4 of 8
I didn't say the same voltage........hince why i said set my voltages indepedently
post #5 of 8
Thread Starter 
Thx guys for the answers very helpful. I tried running BF3 Beta for a while and it seemed well for a while but froze after maybe 20min. I think it was the OC and not just a Beta freeze atleast, since I wasn't able to do anything other then reboot.

Well atleast now I know that my top card is the better OC'er right? atleast on 1v, but the bottom card couldn't possibly do better then the top card now on more voltage, or could it?

Btw would an overclock in my regions, from 715mhz to 820ish do any meaningful increases in say games like BF3?

Next upgrade on the gpu side for me will probably just include 1 card though, its a bit of a hazzle when you OC, going back and forth between 2 cards.


Thx again guys!
First own build!
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 Rampage 3 Formula Gigabyte Geforce GTX 580 SOC Corsair 6GB DDR3 XMS3 PC12800 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD MLC + HD 7K1000.C 1TB Samsung DVD±R/RW/RAM DL 22X Windows 7 Home 64-bit BenQ E2220HD 22" 
KeyboardPowerCaseMouse
Sidewinder X4 Corsair HX 750W ATX12V 2.3 / EPS12V CM 690 II Advanced Intellimouse Explorer 3.0 
Mouse Pad
steelseries 
  hide details  
Reply
First own build!
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 Rampage 3 Formula Gigabyte Geforce GTX 580 SOC Corsair 6GB DDR3 XMS3 PC12800 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD MLC + HD 7K1000.C 1TB Samsung DVD±R/RW/RAM DL 22X Windows 7 Home 64-bit BenQ E2220HD 22" 
KeyboardPowerCaseMouse
Sidewinder X4 Corsair HX 750W ATX12V 2.3 / EPS12V CM 690 II Advanced Intellimouse Explorer 3.0 
Mouse Pad
steelseries 
  hide details  
Reply
post #6 of 8
It will. After changing my cards from 780mhz to 850mhz in WoW I saw 5-10fps increases. Also in BC2 my frams NEVER go below 60fps with vsync on. Really haven't done any other comparisons. Depends on the game and how intensive it is.
Edited by MURDoctrine - 10/6/11 at 8:47am
post #7 of 8
Now, while it's totally possible to set clocks/volts independently on each card, to me futzing with the two cards separately is more hassle than it's worth ... but I'm lucky in that both my cards have the same stock vid (.975) and seem to have a clock/volt profile that's pretty similar. Hence, I always just choose 'sync similar cards' in AB, and set the volts/clocks the same on both cards.

This being said, if I had wildly different cards (like one has stock vid of .975 and the other was 1.05V) I might adjust each card to a different voltage, but as others have said, I'd want them at the same clocks.

While you can run your cards at different clocks, in testing I did in the past I found that performance stays the same as it would if I ran both cards at whatever is the lowest of the two clocks. At least it did on the 2 games I tested it on.

What I'm ultimately getting at here is that unless your cards are REALLY different in their voltage requirements (by that I mean at least a 50mV difference in stock vids), when you go to overvolt for the purpose of OC'ing, it's a heck of a lot easier to just sync the two cards and set the voltage/clocks the same for both, and the downside of the simple approach is going to be quite minimal. Talking about a couple extra degrees of temp on whichever card you *could* set to a slightly lower voltage at the clocks you've chosen for both ... not a big deal IOW.
    
CPUMotherboardGraphicsRAM
xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
Hard DriveOptical DriveCoolingOS
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb... plextor px-712sa - still the best optical drive... corsair h8o v2 aio W10 home 
MonitorPowerCaseAudio
asus vw266h 25.5" (1920x1200) abs sl (enermax revolution) * single 70A rail 850w silverstone rv-03 XFi Titanium 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
xeon X5675 6-core @ 4.1ghz (1.29v, 20x205 +ht ) rampage iii extreme msi rx470 gaming X (the $159 budget king) 3 x 2gb corsair xms3 pc12800 (9-9-9-24-1T@1600MHz) 
Hard DriveOptical DriveCoolingOS
hynix 250gb ssd (boot), 2tb deskstar (apps),1tb... plextor px-712sa - still the best optical drive... corsair h8o v2 aio W10 home 
MonitorPowerCaseAudio
asus vw266h 25.5" (1920x1200) abs sl (enermax revolution) * single 70A rail 850w silverstone rv-03 XFi Titanium 
  hide details  
Reply
post #8 of 8
Quote:
Originally Posted by brettjv View Post
Now, while it's totally possible to set clocks/volts independently on each card, to me futzing with the two cards separately is more hassle than it's worth ... but I'm lucky in that both my cards have the same stock vid (.975) and seem to have a clock/volt profile that's pretty similar. Hence, I always just choose 'sync similar cards' in AB, and set the volts/clocks the same on both cards.

This being said, if I had wildly different cards (like one has stock vid of .975 and the other was 1.05V) I might adjust each card to a different voltage, but as others have said, I'd want them at the same clocks.

While you can run your cards at different clocks, in testing I did in the past I found that performance stays the same as it would if I ran both cards at whatever is the lowest of the two clocks. At least it did on the 2 games I tested it on.

What I'm ultimately getting at here is that unless your cards are REALLY different in their voltage requirements (by that I mean at least a 50mV difference in stock vids), when you go to overvolt for the purpose of OC'ing, it's a heck of a lot easier to just sync the two cards and set the voltage/clocks the same for both, and the downside of the simple approach is going to be quite minimal. Talking about a couple extra degrees of temp on whichever card you *could* set to a slightly lower voltage at the clocks you've chosen for both ... not a big deal IOW.
Well I can vouch that MSI afterburner in my case on MSI! cards only changed the Hawks vcore which is my sync card. I verified that the voltage of my cyclone remained unchanged untill I went in changed it. This is probably due to the gap in stock voltages on them though.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: NVIDIA
Overclock.net › Forums › Graphics Cards › NVIDIA › OC'in SLI