volts and heat

[adolf hamster]

ok, so here's the story:

after having got a new 290x, and finally replaced my psu, decided to eliminate some of the bottleneck from the cpu with a bit of clocking. first time and all and i reckon i have the principle ok, but need a few pointers.

specs:
fx8150 [yes i know....]
990fx sabertooth [gen 1]
r9 290x reference [powercolour, not oc'd because of the heat]
wd black 1tb
alpenfohn k2 with a pair of corsair sp120's instead of vanilla fans
corsair ax860 psu

all stuffed in an air 540 case

so here's the story of how it went. i've been clocking just with multiplier and cpu voltage offset:
3.6-4.0ghz [18-20 multiplier] on stock voltage [1.2]
4.2 [21 multiplier] on +0.00625 voltage offset

all of these lasted 10 minutes on prime 95 blend [will be running a 24hr test once i'm happy with it because i need it 24/7 stable]

the issue i'm having, is at 4.4ghz, i'm going to +0.04735 voltage offset, this setup is stable for the 10min test, and cpuz is reading 1.356v

problem is, on the k2 temps are skyrocketing for that, 80 degrees for the vrm's and 71 degrees on the cpu.

now in terms of voltage input that doesn't seem to bad to me, but i was under the impression the k2 would be capable of keeping a lid on the temps up to circa 4.6 with 1.45 volts before i had to worry, despite the 8150 having the same thermal output as a small volcano.

so question is, bad cpu? bad cooler? or am i doing it wrong?

 

[mmj_uk]

It's just the architecture in my experience, when I had FX8350 I switched between D14 and high end water several times and the socket temperature under Prime95 hardly changed, if anything water cooling was worse for overclocking because the VRM heatsink had no fan blowing directly onto them.

You have an FX8150 which are hotter/more power hungry and a 290X basically radiating heat, that's why I recommend Intel processors they're far less hassle to cool so long as you don't bump up the voltage too high. The FX8350 can only really Prime at stock settings beyond that the chip is overwhelmed by heat which is presumably why AMD haven't released faster variants (apart from the joke 225W chips that aren't really capable of heavy workloads without some sort of throttling).

 

[adolf hamster]

fair enough, ill maybe drop the voltage im currently running on 4.3 until it can keep cool for a 24hr prime run and accept thats my ceiling.

gonna be moving to intel, maybe haswell e (big jump ), at some point but cant afford it now so ill just have to live with it. at least thanks to mantle I can still play bf4

 

[adolf hamster]

single posted, then somehow managed to double post with an edit