780 TI SLI

Snodge · 12 Mar 2015 at 10:53

Morning guys, My current setup is as follows :
Asus Extreme extreme lga 2011
3930K @ Stock
16GB Ram
1250W PSU
Evga Classified 780TI 1150/7000

I've just purchased a second 780TI and was wondering whether I'd actually see any massive benefits or will my CPU bottleneck me due to it being at stock speeds?

ubersonic · 12 Mar 2015 at 11:28

Yeah a 3930K is going to be a massive bottleneck with two GPU's as it only has 6c/12t sadly

(This is sarcasm, you'll be fine).

Snodge · 12 Mar 2015 at 11:30

Really even at 3.2Ghz?

ubersonic · 12 Mar 2015 at 11:38

Snodge said:
Really even at 3.2Ghz?

It will never actually be just 3.2GHz unless something is wrong, the 3930K has the following Turbo Boost clocks:

1 core: 3.8GHz
2 core: 3.8GHz
3 core: 3.7GHz
4 core: 3.6GHz
5 core: 3.5GHz
6 core: 3.5GHz

So under load it should be hitting 3.5GHz even when using all cores, unless it's not really stressed or it's throttling. A more realistic explanation is 3.6+ as most games are lightly threaded.

The 3930K is still a top of the line CPU, the 4930K/5820K are only marginally faster as Intel is walking the race against AMD right now.

(I'm not saying you wouldn't get a slight boost by overclocking your CPU, you always do, just that the CPU at stock isn't going to choke the cards like an older i7 920 or something would).

Snodge · 12 Mar 2015 at 12:28

Thanks for your help mate

Looks like I'll be repasting my 780ti tonight then and adding the new one

Geeman1979 · 12 Mar 2015 at 12:36

You'll have no problems. The 3930k's still a potent chip and clock well. If you're wanting the best out of your cards then clock, it's easy enough. Check this guide for more info!

Plenty more about if you search.

http://forums.overclockers.co.uk/showthread.php?t=18476907

ALXAndy · 12 Mar 2015 at 12:39

You'll need to overclock the CPU if you want the best out of it.

Snodge · 12 Mar 2015 at 12:40

Whenever I tried to overclock my CPU prime would just instantly crash no idea why

I was able to overclock my 4670k fine before however this overclocking is quite different.

Geeman1979 · 12 Mar 2015 at 12:41

What cooling have you got?

Snodge · 12 Mar 2015 at 12:44

http://www.overclockers.co.uk/showproduct.php?prodid=HS-003-PT&groupid=701&catid=2330&subcat=2348

Idles at around 38-40

Full load - maximum 60

Geeman1979 · 12 Mar 2015 at 12:46

You should be fine with that. Follow 8packs guide and start by dialing in 4.4. That should be a given with a 3930k, possibly even at stock volts.

Snodge · 12 Mar 2015 at 12:48

The guide seems quite complex to me

Geeman1979 · 12 Mar 2015 at 12:54

It's based on the same board as you've got, so just copy the settings using your own ram speeds and timings. Take your time and you'll be fine.

Snodge · 12 Mar 2015 at 12:59

My Ram is capable of 2133mhz

Should I try to run it at 2000mhz or just leave it at 1333?

Geeman1979 · 12 Mar 2015 at 13:02

Whatever the stock speed/timings of the ram is, run them at that. Dial in 1.35v as a starting point for 4.4 which should be plenty and monitor your temps.

ubersonic · 12 Mar 2015 at 13:03

Snodge said:
The guide seems quite complex to me

If you want an easy mode, just set the Turbo option in the BIOS from the standard "per core" mode to "by all core" mode and set the value to 40 or 42. That will run the CPU under load at 4GHz or 4.2GHz regardless of the amount of cores being used, and will adjust the voltage itself to make it work (NB: it will overcompensate to aim for stability so will run a bit hotter than if you did all the fine tuning yourself).

Snodge · 12 Mar 2015 at 13:06

I tried that turbo option and it just crashed instantly on me.

Geeman1979 · 12 Mar 2015 at 13:11

You'll have to read and follow the guide and have a go. If you run into difficulties then post up a thread. Plenty around here to assist.

Snodge · 12 Mar 2015 at 19:36

Followed all of those sets was running prime for around 1 minute temperatures didn't go above 65 degrees then windows 8.1 crashes and restarts my PC any idea guys ?

ALXAndy · 12 Mar 2015 at 20:10

Probably need more volts matey.