Can I take the AMD fx-8300 to the 1.55v limit?

[happymeal79]

Apparently only a few people have this cpu so I can't find much information on it.

The lower TDP and stock voltage(stock is 1.25v or something, where 8350 starts at 1.35v i think) are confusing me. I looked up the voltage range and it's basically the same as the other 125tdp fx83xx's

fx8300=0.825-1.425V
fx8320=0.800-1.425V
fx8350=0.815-1.450V

so i'm wondering how far I can push the voltage on this thing.

I have good cooling, temps are real low at 4.2ghz@1.425 volts. (seems kind of low at that volage but maybe it's a bad batch)

read a thread where someone got their fx8300 to over 5ghz at over 1.5v but I have no idea if he was just pushing it for the numbers or if it was safe or not.
Anyone have experience with lower TDP AMDs?

Thanks in advance.

 

[griptwister]

No one that I know of has FX 8300, but I wouldn't push it... 1.5v is close enough lol.

 

[chrisafp07]

I wouldn't go past 1.55v. I am running 4.6ghz w/ 1.42 Vcore stable currently with my 8350.

http://valid.canardpc.com/2735934

I also have my RAM downclocked to 1400mhz due to instability at 1600mhz which I still cannot figure out. nonetheless my cinebench score right now is 7.96-8.00 I'm happy with that.

 

[happymeal79]

thanks, I took it to 1.55v and could only get 4.8 barely stable, passed ibt but not p95. But the temps skyrocketed, not to dangerous levels, still under 60 but closer than I'd like, more than my h80 and other cooling mods could handle i guess. I'm thinking of sending my brother a few 8300s so he can sell them on ebay so fellow enthusiasts can get there hands on it and i can get more information. i live in japan and can just go buy it at the store.

 

[griptwister]

thanks, I took it to 1.55v and could only get 4.8 barely stable, passed ibt but not p95. But the temps skyrocketed not to dangerous levels, still under 60 but closer than I'd like, more than my h80 and other cooling mods could handle i guess. I'm thinking of sending my brother a few 8300s so he can sell them on ebay so fellow enthusiasts can get there hands on it and i can get more information. i live in japan and can just go buy it at the store.

How much you going to sell them for?

 

[chrisafp07]

thanks, I took it to 1.55v and could only get 4.8 barely stable, passed ibt but not p95. But the temps skyrocketed not to dangerous levels, still under 60 but closer than I'd like, more than my h80 and other cooling mods could handle i guess. I'm thinking of sending my brother a few 8300s so he can sell them on ebay so fellow enthusiasts can get there hands on it and i can get more information. i live in japan and can just go buy it at the store.

Yea, get a broad range of results with different motherboards. I can't get stable past 4.6, I can bench up to 5.0 at 1.49 but it gets too hot and Prime doesnt run for 4 min. I've had so many issues with RAM with this cpu it has been odd.

 

[happymeal79]

I'm sure you're a veteran oc'er so i'm not going to try to give you advice on ram tweaking. I haven't had an issue with ram on my set up, would scale them down and loosen the timings to oc and then turn them back up after. Ran memtest and no issues. didn't even have to turn up the ram voltage. Anyways, do you run it at 4.6 24/7?


@grip I don't know, was just going to see how much they'd go for on ebay and see if it's worth the trouble of sending more, shipping is kind of expensive from japan to US.

 

[chrisafp07]

Yes, 4.6 24/7, I have run memtest for 24hours at 1600mhz with no problems but I get miscalculations in Prime 2hrs in if I have ram above 1400mhz. I think it is my mobo, or some restriction I cannot figure out. I've been all over the forums here and elsewhere but to no avail. I'm happy where I bench at right now and my temps are never above 45c in ultra settings in most games crysis 3, TR, the likes. Odd ram issues lol, manual timings dont help, tried all different timings, loose, tight, 1 stick, 2 sticks lol, 3 sticks, different slots. Its annoying to say the least but hell if anyone has a fix I'd love to know so don't hold back any thoughts ;p

 

[happymeal79]

45c is your core temps? damn that's nice, I can't see my core temps(known issue, shows up as 5-8 degrees on boot up and moves up slightly, ambient temp is about 19-20) I have to go by the mobo's reading and a rough estimate on my core readings (the guy that programmed core temp said adding roughly 15 degrees is about right) but the false core temp readings moved up to 42 when i went to 4.8ghz) adding 15 degrees is pretty close to that 61 degree mark. weird thing is my mobo's cpu monitor is still pretty cool, around 49-51@4.8ghz.

About ram, have you tried increasing nb voltage? Or as a extreme measure, downclocking the nb. I heard matching the speed to 1866 ram can get your higher overclocks. never tried it, and not sure it relates to your problem.


Edit: I just read that that low idle temp reading is calibrated for accuracy at the higher end of the scale, do you think it means i'm actually well under temps? maybe i can go higher.

 

[chrisafp07]

AMD is stating that thier sensor is accurate after 40c, because my idle temps are VERY low as well.

Yes, my system never goes over 45c when gaming, but when I stress test I see 59c in late stages of Prime. I haven't attempted downclocking the NB because I'm afraid to lose performance their when my ram frequency probably is not even noticeable. Another oddity is the fact I bench higher at 1400mhz compared to 1600mhz, I'm not a hardware expert so it is interesting to see that.

Have you tried other programs? I love HWinfo64 and HWMonitor, HWinfo64 is nice though because you can load just sensors and look at max temps reached, average temps, and minimum temps while seeing the same info for other sensors on the motherboard, all are labeled, it is an awesome tool.

 

[happymeal79]

Thanks for the recommendations, I use hwmonitor and I'm checking out hwinfo64 now, it's not reading my voltages right but maybe I can tweak it, it's showing stock voltage for my cpu when i up'd it a lot, showing correctly in hwmonitor though. What is t1/d1+ temp? I've never seen that one before.

There's no reason why benches at 1400 would be better than 1600, the difference should be the opposite but barely even noticeable. look at this guide for nb underclocking, they guy says that you save power in some places making other things more stable, and impact to performance is minimal (according to him)

http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard

look at unofficial overclocking method in post 3.

 

[chrisafp07]

Make sure when using HWinfo64 not to refer to VID but to Vcore, and also only load sensors, it is a checkbox option when you load the program. t1/d1 not sure, probably a motherboard sensor. Is there a CPUTIN temp? Make sure to follow only package temps with your FX8350. CPUTIN or CPU Socket temps are usually 10-15c aboce cpu package temps.

Yes, I'll check that out, see if underclocking NB could help me get ram stability.I notice huge jumps in temp also with higher memory clocks, I've seen ppl say here and there the 8350's imc works hard and runs hot. Idk.

 

[chrisafp07]

Well you now have me attempting that tweak, lets see if I can finally get this ram stable at 1600. Thanks for your help as well, tip offs are always nice. Underclocking the NB is the only thing I feel I havent tried.

 

[happymeal79]

hmm, i never heard that memory speed affects cpu temp, maybe case temp. I might run some tests later to see.

You're right I was looking at the wrong voltage reading, i see the right one now.
the only temps i see are cpu 0 under the cpu, and cpu, aux, motherboard, t1/d1+, under the motherboard. and also gpu temps. You were right this program is nice, I like being able to hide all the unnecessary values.

 

[chrisafp07]

Well awesome, stable with IBT Standard and very high, I even lowered my Vcore. So simply lowering my NB down to match 1600mhz was it. Amazing, I'm going to be testing now past 4.6 to see if I can get stable and then I'll run prime overnight if so.

Yea, once I found HWinfo64 its my favorite now I like being able to see average temps and voltages, I can leave it up during gaming and come back to see how my rig is cooling.

Follow the CPU 0 Temp, under packages.

 

[happymeal79]

Hey that's awesome, I'm glad you found a fix. Seems like it might be nb voltage then, perhaps you can run nb at regular a higher frequency if you up it's voltage.