AMD FX 9590 and older mobo - need advice / feedback

turbodan

Commendable
Oct 21, 2016
33
0
1,540
Hey guys. Recently I decided to upgrade my 5 year old rig with cheap, yet effective hardware. I have an older Gigabyte 970a-ud3 mobo, 8gb 1666mhz geil ram, 1tb hdd, Radeon Xfx 470 4gb, and an AMD fx 9590 cpu with a strong cooler master dual fan air cooler.

First recent upgrade was the vid card, but during WoW play, which often takes a toll of the cpu bc of the vast world it needs to process, I noticed my old AMD phenom x1100t would bottleneck the 470 (I also play maxed out everything on 1080p). So, I figured I'd replace the CPU too. Went to microcenter, and was initially considering an 8350 for a cheap and efficient upgrade, but it turns out they had the FX 9590 for only 160 bucks. Yes, I'm aware of the reviews and background of the 9590, but for 160 bucks?

The 9590 went into my 970a-ud3 (rev 1) without issues. Applied new thermal compound and equipped the freshly cleaned cooler master heat sink. When firing up the computer, everything booted fine, but the first thing I always check is HWmonitor. It did indeed show all 8 cores, correct cache speeds, etc, but every core was only clocked to 4ghz. Now I understand this is bc I have an older motherboard and it can't meet the disgusting demand of 225w for the cpu. But since it can't do this, it keeps it at a solid 4ghz, and amazingly runs at no higher than 42degrees celcius on air, even when gaming hard.

The only thing I did notice is that at the 4ghz run speed, it's only using about 1.360 volts. This is fine w me, bc it's running pretty damn cool and still efficient, but sometimes, for a split second, itll drop to say 3200mhz. You can't even notice the difference in gaming or general usage, but my HWmonitor will log it as the min speed. It happens immediately, and doesn't stay at that speed. It's like an instant dip, then goes back to 4ghz solid for 99.9% of the time? Any reason why?

Sorry for the long post, but my ultimate quest is what do you guys think I should do w this setup? Should I just accept the current setup, and that I have a 9590 I got for cheap that's running at a cool speed, although it's only at 4ghz? Even though the speed is at 4ghz, It still appears everything else is on point, like cache speeds, and all 8 cores operating. Should I just leave it as is and be content with a 4ghz 9590, lol? And also, should I be concerned about the immediate split second dips in mhz? No effect on performance, but it's odd to see it at 4ghz all the time and then record a 3200mhz low.

Thanks!
 
Solution


You really need top-notch voltage regulation with a CPU...
I think you should seriously reconsider putting an FX-9590 in a motherboard that can't handle it! It's not only the CPU that you need to think about, it's the VRM as well. This provides voltage to the CPU and without proper cooling, there's a real chance of the motherboard PCB melting.

The motherboard is the most likely cause for the drop in clock speed.

What's the make and model of your PSU? That's another important factor to consider with an FX-9590.
 

DSzymborski

Curmudgeon Pursuivant
Moderator
What BRM said. This is a completely unsuitable motherboard for a 9590 (this may very well be the worst consumer-driven CPU that AMD has ever released). 220W TDP is no joking matter and it's not for frivolous reasons that AMD strongly urges very high-end power and cooling solutions. Your motherboard is desperately trying to treat it as an FX-8350 (a 9590 is simply a binned 8350 with a giant factory overclock) so that it doesn't fry.
 

turbodan

Commendable
Oct 21, 2016
33
0
1,540
Forgot to mention, it's a 630w Rosewill green series psu. I know that's on the low side, but like I said, all my temps are fine bc of the downclock to 4ghz. That's why I think this setup oddly works - the motherboard can't feed the cpu the full 225w, so it only runs it at 1.360 volts instead, and in turn I get much cooler temps and a .7ghz downclock.

SO, I can spend an extra 200-300 more on a new motherboard, psu, and likely water cooling to accomodate the new setup, or just leave it as is and accept the 4ghz speed instead of the advertised 4.7ghz. If my cpu is only taking the 1.360v, and running barely higher than 40 celcius on air, I think the VRM would be fine too.
 

DSzymborski

Curmudgeon Pursuivant
Moderator


You really need top-notch voltage regulation with a CPU that has such insane power demands. Honestly, if I'm still within the return window, I send that CPU back and either get a real 8350 that the motherboard won't constantly fight with rather than simply count on the stressed motherboard keeping itself alive constantly or save up for the better platform and make a Kaby Lake/Zen decision in 2017.

You're clearly budget-minded; destroying your motherboard (or worse) is hardly a budget-minded decision. Good deals like these are frequently very expensive.

I absolutely wouldn't dump 200-300 into this rig to get a CPU like this working. For 300, you can actually buy a CPU and a motherboard that are far better than any 9590 build, either an i5 Skylake/Kaby now or Zen next year. Don't throw good money after bad.
 
Solution

turbodan

Commendable
Oct 21, 2016
33
0
1,540
Thanks for the feedback. I guess I'll just head back to Microcenter and swap it for an 8350. Same exact cpus like you said, but the my mobo is actually compatible with the 8350 and it's required wattage.
 

DSzymborski

Curmudgeon Pursuivant
Moderator


Good move. And you'll be able to overclock it safely, monitoring what your motherboard can handle. It's not as sexy on a written spec list, but you'll be able to not constantly worry about your motherboard giving up the ghost.
 

turbodan

Commendable
Oct 21, 2016
33
0
1,540


One more question - I saw the 8350 is compatible with my 970a ud3, and that cpu only runs at 125w which my mobo can supply. The 8350 is at 4ghz, but would w turbo it's at 4.2. Do you think I can enable turbo and get the extra 200mhz? I ask because I've never seen above 4ghz thus far with my setup. I overclocked my old phenom 1100t to 4ghz and never went higher, but when I tried overclocking the 9590 to get maybe 4.2, 4.3ghz, even though I changed the voltage and settings in bios, it never went above 4ghz. I assuming this is just bc the nature of the 9590, and that the 8350 should be able to achieve 4.2ghz, right?

 


Absolutely. Maybe more.

I'm running a 8320 on a UD3P and it will run 4.6-4.7 stable (needs a good voltage bump to do so, though).