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Weird SLI setup Help

post #1 of 129
Thread Starter 
Hello I'm having Weird Problems last nite I bought a card & I have a Gtx 670 ftw 2gb & a 670 SC 4gb & when I hooked them up SLI I got weird Results telling me Display monitor was on Second Card so I switch my Cards around at x16 x8 & it shows this Now

Before





What I'm Having Trouble with is Everything Setup Right?? & ALSO When I set my Overclock on my First Card........... My Second Card Overclocks the Same as my First Card Why is that lol??? Can't I Not Overclock both my Cards when SLI?? :/








Here my Results Last Nite 3+hrs Stress Testing on my Gtx 670 FTW 2gb yessir.gif
post #2 of 129
Thread Starter 
I ran Heaven & was only getting 40Fps like WOW whats going on & My first card is up in the 1100+mhz & my Second card is this my Gtx 670 ftw 2gb something not right

post #3 of 129
"When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. However, while it is not recommended, NVIDIA does offer the flexibility to run graphics cards with different sized memory by using CoolBits. Using CoolBits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate them together in SLI mode. When dissimilar memory sizes are enabled to work together using CoolBits, the effective memory size for each card becomes the smaller of the memory sizes."

http://www.geforce.com/hardware/technology/sli/faq
post #4 of 129
Thread Starter 
lol ya someone told me on the GTX 670 Overclock forum that it would only run in 2gb instead of 4gb!!! I bought this card last nite from someone for $240 bucks lol & I have never done this before so I have no clue on what to do & stuff lol
post #5 of 129
How come you bought a 2GB card and a 4GB dude? Thats such a waste frown.gif Memory is mirrored in SLI which means if you SLI two 2GB cards, you still only have 2GB in total. As you have a 2GB and 4GB together, your 4GB will only use 2GB

They are overclocking the same because you have the 'Sync on' checkbox ticked! Untick it if you want to manually overclock.

You will gain nothing by overclocking the top card more as when cards are in SLI they only run as fast as the slowest card. EVGA Precision X will say they are running at different speeds but they are not.

Also you need to enable SLI in the nvidia panel if you havent already done so.

Its worth putting the faster card in the top slot in SLI because then games that don't support SLI, can use the fastest single card.
Edited by Darylrese - 4/27/13 at 4:40am
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post #6 of 129
SLi technically should work right with a 2GB and a 4GB card but seems to not like it.
I have seen it not work before too.
take one of the cards back pairing up one or the other and do not mis-match cards, not even RAM.
my opinion.

Darylrese - has got you on the right path.. thumb.gif
post #7 of 129
Thread Starter 
Where is coolbits what is that lol never heard of that before & how do I lower this 4gb to a 2gb? is this why this causing all this problems I'm having when trying to overclock first card then different on the other but its set at the same Overclock as my first card when I apply it :/
post #8 of 129
Thread Starter 
Quote:
Originally Posted by Darylrese View Post

How come you bought a 2GB card and a 4GB dude? Thats such a waste frown.gif Memory is mirrored in SLI which means if you SLI two 2GB cards, you still only have 2GB in total. As you have a 2GB and 4GB together, your 4GB will only use 2GB

They are overclocking the same because you have the 'Sync on' checkbox ticked! Untick it if you want to manually overclock.

You will gain nothing but overclocking the top card more as when cards are in SLI they only run as fast as the slowest card. EVGA Precision X will say they are running at different speeds but they are not.

Also you need to enable SLI in the nvidia panel if you havent already done so.

Its worth putting the faster card in the top slot in SLI because then games that don't support SLI, can use the fastest single card.


lmao thanks man you finally helped me solve that problem haha & I bought the Gtx 670 ftw 2gb cause someone I know had brand new in BOX for $240 sold it to me lol they are like $420 bucks Newegg & all that lol............ & Im just contacting the guy Email right now bout the 2nd Gtx ftw card prob End up Paying another 200 bucks for it he wanted like $450 all together for both cards!!
post #9 of 129
Quote:
Originally Posted by NightHawk06 View Post

Where is coolbits what is that lol never heard of that before & how do I lower this 4gb to a 2gb? is this why this causing all this problems I'm having when trying to overclock first card then different on the other but its set at the same Overclock as my first card when I apply it :/

Because of the sync checkbox and like i said, you wont gain anything by overclocking them differently.

Coolbits is a registry key that unlocks overclocking for nvidia drivers without additional software but i wouldn't use it these days.

I would consider swapping them to be matching cards, the 4GB would be the best option.

I have two Asus Direct CU II GTX 670 2GB in SLI and love them.

Good price, but maybe not the best option when you already had a 2GB card. thumb.gif

Just noticed aswell how come your GTX 670 is boosting to 1.21v? It should only go as far as 1.175v Sounds like the BIOS may have been changed?
Edited by Darylrese - 4/27/13 at 4:46am
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Intel Gaming PC
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Samsung EVO 840 250GB SSD, Seagate Barracuda 3T... Full custom watercooling loop Windows 10 Pro 64bit Acer XB271HU  
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post #10 of 129
Thread Starter 
I dont see anywhere to Enable SLI?? & on Device manager both of my Cards are SHowing!!

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