Sign in with
Sign up | Sign in
Your question
Solved

GTX770 SLI Issues

Tags:
  • EVGA
  • Cooling
  • SLI
Last response: in Graphics & Displays
Share
July 16, 2014 9:59:16 PM

I just recently bought another EVGA 770gtx, with the ACX Cooler, its the superclocked one.

I already had a 770gtx, but the new one is 4gb vs the old one is 2gb. It's my understanding I will simply only have 2gb of vram available. My plan was to eventually sell my 2gb one and buy another 4gb when I need more vram, if that ever comes.

The rest of my setup is this:

4790k
ASUS Maximus VII Hero (ROG one)
16gb of g skill sniper series ram DDR3 1866
win 8.1 64 bit pro
Corsair SSD
Corsair H100i extreme performance cooler
Phanteks Pro Case
EVGA 1300 g2 power supply.
etc etc

So the nvidia control panel doesn't show SLI anywhere.

Both cards seem to work fine alone.
My mobo supports SLI, the BIOS shows both cards running at x8. Both vid cards have worked individually.
I completely uninstalled the drivers and reinstalled.
I updated my bios just now.

Still nothing.

Most of the similar threads ended up being GPU's that weren't the same or mobo's that don't support SLI. I think my setup should be working, just not sure why. I am going to try swapping out the SLI bridge for a different one I think I have from my old mobo.

I did try to move the SLI bridge between the front and back connectors, neither worked. Also tried flipping upside down and wiggling etc. That didn't seem to work. I can do screen shots if need be.

Let me know guys, thanks.

Update: Here is what my nvidia panel looks like :

More about : gtx770 sli issues

July 16, 2014 10:20:44 PM

I've got a very different ASUS board, but maybe my crossfire problems are similar to your SLI, I know for me I had to go into the bios and choose how the second PCIe slot worked, on my board, infinitely cheaper and nothing comparatively to your board other than manufacturer, my second slot can be 4x which is the only way it's compatible for crossfire, or 2x, 0, 0, 2x shared with the PCIe X1 slot. It could be something along those lines.
m
0
l
July 16, 2014 11:06:36 PM

So I think the gtx 680's and the gtx 770's are the same video card if I am not mistaken. I think the 770's are rebranded 680's but someone feel free to correct this.

If that is the case, I saw this thread:

http://www.overclock.net/t/1368049/sli-not-on-option-in-nvidia-control-panel-w-2-gtx-680s

I was pretty sure that VRAM didn't matter and it would default to the lower of the two. But this thread seems to show that you need two cards with identical VRAM.

Is that my issue most likely?
m
0
l
Related resources
July 16, 2014 11:27:09 PM

murlo26 said:
So I think the gtx 680's and the gtx 770's are the same video card if I am not mistaken. I think the 770's are rebranded 680's but someone feel free to correct this.

If that is the case, I saw this thread:

http://www.overclock.net/t/1368049/sli-not-on-option-in-nvidia-control-panel-w-2-gtx-680s

I was pretty sure that VRAM didn't matter and it would default to the lower of the two. But this thread seems to show that you need two cards with identical VRAM.

Is that my issue most likely?


I'm fairly certain that the 770 is a 680 rebadge, but not 100% Haven't really been paying that much attention to the green team in a while, too expensive for my tastes. I thought they would default to the lowest too, but last time I had SLI I had the exact same card, and with NVidia I know you need the same card. Thought different memory same chip was allowed though... Have to wait and see if anyone else chimes in.
m
0
l
July 17, 2014 8:03:18 AM

After posting this in another forum and my own research, I am quite certain its a VRAM issue. I am picking up a 4gb one from microcenter to test and verify. If that works, then VRAM was the issue.

Apparently nvidia used to support varying VRAM but no longer does, so bummer :( 

DO NOT MIX VRAM! (posted for other people searching).

It seems like this is a common misconception as it used to be ok so people still say its ok to mix VRAM quantity in SLI, but its not, must both be the same.

I will update tonight.
m
0
l
July 19, 2014 9:35:37 PM

I would like to mention, the GTX 680 and 770 use the same core architecture but are different cards as they have different memory controllers and the 770 has enchanced voltage regulators and microcode for the GPU. Nvidia's SLI also mirrors Memory unlike AMD's Crossfire which Extends it (kind of like RAID 0). Thus SLI requires the same memory configuration on both GPUs. I am not aware they ever supported different memory volumes on cards in SLI and I have been using Nvidia in all of my builds since 2005. AMD cards required too much power, generate too much heat, and have way too many driver, crossfire, and software issues for my taste. They have awsome budget CPU's for gaming though. Oops, Im ranting....
m
0
l

Best solution

July 20, 2014 2:00:58 AM

Xibyth said:
I would like to mention, the GTX 680 and 770 use the same core architecture but are different cards as they have different memory controllers and the 770 has enchanced voltage regulators and microcode for the GPU. Nvidia's SLI also mirrors Memory unlike AMD's Crossfire which Extends it (kind of like RAID 0). Thus SLI requires the same memory configuration on both GPUs. I am not aware they ever supported different memory volumes on cards in SLI and I have been using Nvidia in all of my builds since 2005. AMD cards required too much power, generate too much heat, and have way too many driver, crossfire, and software issues for my taste. They have awsome budget CPU's for gaming though. Oops, Im ranting....


SLi did support different Vram amounts in the past but it was cards like XFX's 7800GTX's that chucked a spanner in the works and by the time the 9800GTX and the GTS250's were around it had gotten confusing as to what could and couldn't SLi with what so with the move to the 2xx cards Nvidia seemed to have put a stop to Sli with different Vram amounts although Coolbits still allowed you to get around the restriction for a while.
Share
July 20, 2014 9:23:43 AM

I bought another (3rd 770 from microcenter) and problem solved by going to another 4gb. I did get it to kind of work with coolbits but was horribly unstable. Better to just keep same VRAM. Thanks guys.
m
0
l
!