Gtx 760 overclocking questions

Alexandros Petrou

Reputable
Aug 10, 2015
55
0
4,630
Hi to all once more!
I'll cut straight to the chase here cuz my time is limited.I just upgraded to a gigabyte gtx 980ti about close to a week ago and decided to give my gtx 760 over to my younger brother.
As anticipated , he decided to do his own stuff and try to upgrade the card I just gave him, providing(guess!) only fruitless results.As I wasn't sure he was doing things right, I took over and decided to give the core clock and the memory clock slider a go, pumping up the fan to 100% and taking a unigine benchmark for every seperate 10 increment on core clock alone and then 20 increment on memory clock, reaching respectively a 50/150 core and memory clock stable oc.
I didn't touch the core voltage at all up until I wanted some more out of it, since 50/150 core and mem clock is a bit negligible.So about 45 minutes later and the clocks sitting at 80/200 each I had my first crash.I decided to up the core voltage abit not much, just 2-3 points out of the all an all 12v slider (using msi afterburner), as I thought I needed to give the gpu a little more power to breathe.It was then when the PC shutted down.Didn't have to think much.I just opened the case and checked the psu.A mere 550w psu from thermaltake.My first thought was that my brother needs a new psu as I checked their website and its a bronze certified one.I don't know if I'm correct or not but with this psu u can't do much anyways as the 760 needs a 500 w minimal psu.
Is it down to the psu or is it just the card what do u guys think.
Very srry for the long post and thx in advance.Ill appreciate every opinion.Ill come back at around 8 hours.Trip inbetween.
 

RazberyBandit

Distinguished
Dec 25, 2008
2,303
0
19,960
OC procedure sounds all well and good. The shutdown...well... It sucks, plain and simple. Oh, and the 500W recommendation for a GTX 760 isn't actually accurate... Manufacturers say that to cover their behinds when their cards are connected to one of the crappy PSU's in the world that use outdated ATX standards from the 90's which still had more power/wattage going to the 3.3V and 5V rails than the 12V one(s).

Does the system still power up and function with no overclock on the card? If not, the card or PSU may have died... You can test the card by sticking it back in your system. If it works, then either the OC was simply completely unstable (including the voltage level) or there is a power delivery issue.

What model Tt PSU is it? Without knowing that, I can only offer this:

If it's not a single 12V rail model but a multiple 12V rail model, it could simply be a matter of having to use a 4-pin MOLEX to 6-pin PCIe converter cable (often included with new video cards) attached to one of the card's two 6-pin PCIe power inputs to "steal" some power from a rail that isn't being taxed by the system's other components.

Most multi-rail PSUs in the 500W range tend to have two 12V rails, usually labeled 12V1 and 12V2, with the 12V2 rail consisting only of the PCIe power connector(s). So, stealing a little power from either a SATA or 4-pin MOLEX lead may alleviate the problem. (At least, for now.)

If that solves the issue, then I'd recommend replacing the PSU with a good PSU that has a single 12V rail.
 

Alexandros Petrou

Reputable
Aug 10, 2015
55
0
4,630
Ye it seems it is either a psu not delivering power or oc instability.Id go with the former, cuz even though I didn't have the opportunity to check the psu's serial number and there is no chance for me to do it for a couple of days(away on business trip, so I'm unable to see if its a solo 12v rail psu), I can't for the life of me relate the problem to anything else than power issue, since it only crashed when I messed around with the voltage slider.Perhaps the psu is enough but sufficient power may be drawn from somewhere else.Perhaps from sensitive parts or the peripherals.Anyways, this all smells psu-related fishy to me
The PC boots normally reverting to the stock clocks so its not a problem of either card or psu dying either.