I was so damn disappointed to find that my new EVGA SC 1080Ti's in SLI were barely an upgrade over my old SLI Titan X's (Maxwell). Im seeing maybe a 5-10FPS increase in gaming generally. I play at 4K games like Fallout, Witcher, Ghost Recon, The Division.
 
If people are able to keep a constant 60FPS at 4K on Ultra settings with a single 1080Ti, then why cant I get close to that with 2?
Im unsure but I believe that my Mobo is doing x8/x8 on the GPUs but I could be wrong. Please tell me where my issue lies. Im ready to upgrade the CPU and Motherboard right now.
 
Specs-
i7 4790K 4.0GHz
Asus Sabertooth Mk. 2 Z97
(2) EVGA SC 1080Ti's SLI
16GB Ripjaws RAM
2TB Samsung Evo SSD
Coolmax PSU 1000W
NZXT H440 Case
Stock fans and cooling, nothing overclocked

Try a Different Driver Version, what Driver are you running?
Did you do a Clean Driver Removal and run DDU to Clean up.
Did you Reset your MB Bios to the Optimized or Default Settings to Force a Read on PCIe Lane Change?
Is your Motherboard Bios 2702?
"x8/x8" Gen3 or Gen2?
How old is your "Coolmax PSU 1000W" Power Supply?
As what dlomond  posted are you using an HB SLI Bridge?
What OS are you Running?

Slim415
 
I was so damn disappointed to find that my new EVGA SC 1080Ti's in SLI were barely an upgrade over my old SLI Titan X's (Maxwell). Im seeing maybe a 5-10FPS increase in gaming generally. I play at 4K games like Fallout, Witcher, Ghost Recon, The Division.
 
If people are able to keep a constant 60FPS at 4K on Ultra settings with a single 1080Ti, then why cant I get close to that with 2?
Im unsure but I believe that my Mobo is doing x8/x8 on the GPUs but I could be wrong. Please tell me where my issue lies. Im ready to upgrade the CPU and Motherboard right now.
 
Specs-
i7 4790K 4.0GHz
Asus Sabertooth Mk. 2 Z97
(2) EVGA SC 1080Ti's SLI
16GB Ripjaws RAM
2TB Samsung Evo SSD
Coolmax PSU 1000W
NZXT H440 Case
Stock fans and cooling, nothing overclocked

The irony in all this is you are the one who posted the "Is 2 1080 Ti's overkill?" thread.  I think you answered your own question with this post.
 
I'm one of those 60 fps with a single 1080 Ti guys...but you knew that.  Your post is exactly why I stand by my opinion of it not being worth it especially if you have a top CPU.  But yet someone told me that the GPU is more of a bottleneck than the CPU with 4k gaming?  Doesn't look like it does it?
 
The answers are right there in black and white and I chose not to ignore the obvious.
 
Good luck OP. 
 
 

ALSO now the PC is shutting itself down while im gaming, its happened 3 times today. When I restart it I get this message during the bootup-
 
"Power supply surges detected during the previous power on. Asus Anti-Surge was triggered to protect system from unstable power supply. Press F1 to run setup"
 
Ive never had this issue before so are the GPUs pulling to much power from my PSU? My last GPU's were the Titan X's and I cant imagine they pulled less power then my 1080Tis.
 
And this could be unrelated but while im monitoring the GPUs in Furmark, Im noticing that GPU in slot one sometimes goes past 100% TDP, while GPU2 is doing 23% TDP. And then other times GPU1 is doing less then 25% while GPU2 is doing over 100%.The temps fluctuate from 60C-80C. I cant make sense of any of it! 
 
 

1. your power supply sounds to me isn't good enough to run those cards.  coolmax has a bronze rating.  I'd go with gold or platinum rating.  2. I'd upgrade your motherboard and cpu like you are thinking of.  the hero MB does 16x 16x on it pcie slots. I have the Formula with a 7700k and I have no bottleneck what so ever.   

Bottlenecks are no good. I hope you can figure it out.

Yea im gonna run one for now and see how that goes. 
Im also about to put in my order for NewEgg for the following-
i7 7700K
Asus Maximus IX Hero
Corsair RMX 1000W PSU
CoolerMaster CPU cooler
 
What do you think? Anyone know what size SLI bridge that MOBO uses?

nvidyuh
Bottlenecks are no good. I hope you can figure it out.

nvidyuh
Might need to do an RMA perhaps.

 
nvidyuh  FYI you can edit your own Posts.

cabbage
The 7700k runs fairly hot. Either change up your cooler, or buy it directly from silicon lottery

I'll second this.  Definitely not a CPU you wanna cheese the cooler with... and if delidding is an option... it's worth it.  

TRClark911

cabbage
The 7700k runs fairly hot. Either change up your cooler, or buy it directly from silicon lottery

I'll second this.  Definitely not a CPU you wanna cheese the cooler with... and if delidding is an option... it's worth it.  

 
Yep.  With my 7700K my radiator was blowing cold air while me CPU was hitting 80s and 90s.  After the de-lid I'm not typically going over 70, and when my CPU is heating up theres hot air coming off the radiator now.
 
Intel screwed up with the 7700K if you ask me.  Much happier after the de-lid.  When i get some time I'm going to do my wife's 6600K too, though it's not the fireball my 7700K was.

Can you pls elaborate on "delidding my CPU". Does that void the warranty? What about the NZXT Kraken liquid cooler, im really interested in that one. Not sure if I would need the 140mm, 240mm or 280mm one. The design would flow very cleanly with my NZXT case. Reminder guys, im not planning to OC my CPU.
 
https://www.newegg.com/Pr...x?item=N82E16835146056
 

 
 

Slim415
Can you pls elaborate on "delidding my CPU". Does that void the warranty? What about the NZXT Kraken liquid cooler, im really interested in that one. Not sure if I would need the 140mm, 240mm or 280mm one. The design would flow very cleanly with my NZXT case. Reminder guys, im not planning to OC my CPU.
 
https://www.newegg.com/Pr...x?item=N82E16835146056
 

 
 

You remove the IHS (I used a tool to do it safely), remove the stock paste and clean everything up real nice, add liquid ultra to the die... use a dab of Loctite gel on the 4 corners of the IHS, press it into place (using a tool for proper alignment), let it set for 2 hours, then add GCExtreme to the Kraken x62 waterblock.
 
Reinstall CPU.
 
Temps dropped for me about 15C...
 
Yes it voids the warranty, but I really don't care.
 
As said I have the Kraken x62 280mm... but if you aren't OCing you could get by for less up to you.  It's a little pricey but worth it.  Does a nice job and looks good too.
 

 

One more thing I wanted to mention to the OP as far as the X99 chipset goes, when shopping for one, read the online manual for each and look at the PCIe layout.  Some boards just do not support X16 on the #1 and #3 slot.  Mine does for sure (Asus X99 Deluxe II) but read the manual of all other X99 boards you're considering before buying.  They usually have a table in the manual showing the different SLI configurations the board can run.  Lastly, there are 4 X99 I7 CPUs, the 6800k, 6850k, 6900k, and 6950X.  Of these, the most affordable and only choice reasonable choice for gaming is the 6850K since it is the first model to support the 40 PCIe lanes you need to run X16 for both video cards.  This together with the high bandwidth SLI bridge should help you out greatly.  I saw a big improvement after going from my 4790k to my current setup (See Signature)
 
Good luck man.  SLI is a bit of an adventure now a days.  Don't expect 100% scaling, but for the games that scale well, it really is a sight to behold.  Just learn to give up the fight and just run on one card if a game doesn't support SLI or does so poorly.
 
Lastly, get a good power supply, I recommend a 1000 Watts Platinum.  My computer routinely draws over 800 Watts when both cards are running during benchmarks, usually in the 760 to 780 range with most games.

here is the delid tool with video instructions. its called the rockit88.
https://rockitcool.myshopify.com/pages/videos
I'm doin my 7700k tomorrow

Category 5

TRClark911

cabbage
The 7700k runs fairly hot. Either change up your cooler, or buy it directly from silicon lottery

I'll second this.  Definitely not a CPU you wanna cheese the cooler with... and if delidding is an option... it's worth it.  

 
Yep.  With my 7700K my radiator was blowing cold air while me CPU was hitting 80s and 90s.  After the de-lid I'm not typically going over 70, and when my CPU is heating up theres hot air coming off the radiator now.
 
Intel screwed up with the 7700K if you ask me.  Much happier after the de-lid.  When i get some time I'm going to do my wife's 6600K too, though it's not the fireball my 7700K was.

Yup, case airflow can be a killer... card killer.