A10-7870K "last review of AMD until Zen"

farmerboy-86 · 19 Jul 2015 at 00:33

hi guys great results here! (as in yours lol)

Just thought i would throw my hat in so to speak,

got my 7870k today from overclockers and wow impressed to say least.
i have it in corsair air 540, with crossblade ranger mobo 750w gold rated psu corsair.
on custom loop overkill i know salvaged from my previous build that went pop

and playing with overclocking and got results below so far 4.5ghz 1.4v

prime95 stable, run quick intel burn test and passed also

further stress tests on going but no core drop outs as yet,

huge improvement over 7850k for clocking my sons rig i cant get 7850k past 4.2ghz

very impressed so far

farmerboy-86 · 19 Jul 2015 at 00:42

Here is my cinebench R15.0 score for 4.5ghz

scored identical to 860k i had in test bench last week

not a huge difference to my sons 7850k @ 4.4ghz which seems odd??
if anyone can shed some light??

seem to get varied cinebench results same clock as above different score if anyone knows why?

Im still learning full ins and outs with overclocking

also my ram is 1866mhz clocked to 2400mhz would new ram with tighter timings help? i.e 2400mhz ram rather than clocking my ram??

TheMorningStar · 19 Jul 2015 at 02:01

Where do APUs sit now when compared to older but high end gfx cards? Have we passed HD4800 performance for instance?

Scougar · 19 Jul 2015 at 03:16

I seriously encourage you to take a look at AMDMsrTweaker. It will stop the CPU declocking at high TDP conditions. (i.e. throttling).

farmerboy-86 · 19 Jul 2015 at 10:04

In cpuz while running benches ect the cpu stays at set GHz don't see any throttling or drop ect

Emlyn_Dewar · 19 Jul 2015 at 11:48

What benchmarks?
I think anything that uses the GPU and CPU together throttles the CPU to 3ghz.
Definitely look into it.

farmerboy-86 · 19 Jul 2015 at 12:28

When u say cpu/ gpu together do you mean on board gpu in chip as I using discrete gpu.

Or am I way off the mark while running firestrike I didn't see any drops maybe I'm wrong.

The program suggested will it disable this problem?

I will look more into it and see what do you suggest best way to check throttling?

farmerboy-86 · 19 Jul 2015 at 17:53

hi guys got the 7870k to 4.6ghz stable prime95 and intel burn test had to bump vcore up to 1.46 though :s

is this ok for everyday use? or to high? should i drop bk to 4.5ghz @ lower vcore you think?

Scougar · 19 Jul 2015 at 18:09

farmerboy-86 said:
hi guys got the 7870k to 4.6ghz stable prime95 and intel burn test had to bump vcore up to 1.46 though :s

is this ok for everyday use? or to high? should i drop bk to 4.5ghz @ lower vcore you think?

I am running 1.5v on the core for my chip (7850K @ 4.5Ghz, 1028Ghz iGPU, 2000Mhz NorthBridge, 2400Mhz RAM). I'm under the impression that 1.5V is considered high though.

Scougar · 19 Jul 2015 at 18:10

Emlyn_Dewar said:
What benchmarks?
I think anything that uses the GPU and CPU together throttles the CPU to 3ghz.
Definitely look into it.

AMDMsrTweaker allows you to alter the power states in Windows so it won't do this.

farmerboy-86 · 19 Jul 2015 at 19:26

Scougar said:
AMDMsrTweaker allows you to alter the power states in Windows so it won't do this.

im not seeing any down clocks what so ever?

i read that its only when onboard gpu is used and temos get high..
im on water and cpu never hits more than 44 stress testing core around 29c

im using my r9 390 just for test purposes to see how well you can game on thhis cheap chip (i know its dont intended for it just curious) swo maybe those two factors are why i dont see down clocks here

also some new results cinebench for 4.6ghz cpu
vcore 1.46v
nb 1.3v @ 2100mhz

stable

nice bump on my last firestrike run too

dont know if this voltage is considered safe for everyday (shorten life of chip)

but considering stock is 1.48v i dont see why not. most consumers will run stock voltage and not overclock im guessing its safe please correct if wrong knowledge is power after all

FlanK3r · 19 Jul 2015 at 22:16

I think OK, cause VID of 7870K is higher...

7870K are good chips for OC, really better than 7850K

farmerboy-86 · 19 Jul 2015 at 23:14

FlanK3r said:
I think OK, cause VID of 7870K is higher...

7870K are good chips for OC, really better than 7850K

Cheers for reply great review by the way!

Yeah I think it will be ok I have power saving on so its not running 1.46v constantly away only under load.

I can get 4.7 but @ 1.5v which I think is to much for my liking for everyday use what you think??

Scougar · 20 Jul 2015 at 01:55

If you are running water 1.5 is probably OK. I've running 1.5 on air (Hyper 212 Evo), and it seems OK so far. (Asus A88X-Pro Motherboard). I have no case fans either, and today it was 100F).

farmerboy-86 · 20 Jul 2015 at 17:33

Scougar said:
If you are running water 1.5 is probably OK. I've running 1.5 on air (Hyper 212 Evo), and it seems OK so far. (Asus A88X-Pro Motherboard). I have no case fans either, and today it was 100F).

Yeah on water running between 29c 32c on idle depending on ambient house temp , and under load max I have seen is 44c socket 30c ish core give or take, that's while running prime and other stress tests

Gaming temps slightly less

Will 1.5v not limit life span of chip running that everyday?? That's my only worry even on water

Davedree · 20 Jul 2015 at 20:25

FlanK3r said:
I think OK, cause VID of 7870K is higher...

7870K are good chips for OC, really better than 7850K

I think that mostly comes down to the solder on the ihs vs the compound.
It gives you 10c headroom which is 100-200 mhz.

Davedree · 20 Jul 2015 at 20:26

farmerboy-86 said:
Yeah on water running between 29c 32c on idle depending on ambient house temp , and under load max I have seen is 44c socket 30c ish core give or take, that's while running prime and other stress tests

Gaming temps slightly less

Will 1.5v not limit life span of chip running that everyday?? That's my only worry even on water

if you're using offset voltage with cool and quiet to overclock then it should be fine.

farmerboy-86 · 20 Jul 2015 at 21:24

Davedree said:
if you're using offset voltage with cool and quiet to overclock then it should be fine.

No I'm using manual voltage with cool quiet much difference?

Settled with 4.6ghz 1.46v

4.7ghz wanted over 1.5v to be fully stable

FlanK3r · 20 Jul 2015 at 22:35

I think, its the same as my side, more sweetpoint is 4600 MHz with lower voltage than 4700 MHz at max voltage

Davedree · 20 Jul 2015 at 23:11

farmerboy-86 said:
No I'm using manual voltage with cool quiet much difference?

Settled with 4.6ghz 1.46v

4.7ghz wanted over 1.5v to be fully stable

With offset voltage and cool and quiet enabled it means your motherboard vrms and phases + cpu cores are able to idle at lower voltage and temps when the cpu cores are idling.
If 90% of the time you're sat idling then offset is the best way.