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AMD FX 8320 and ATI Radeon 7950 vs OCZ ModXStream 500W PSU

post #1 of 14
Thread Starter 
Hi Everyone,

I understand that given it's my first post, i should probably introduce myself and avoid going ahead to asking questions, but my problem is a bit urgent, so I'm really sorry.

Let me get to the point. I had to RMA a CPU and GPU recently. Given that both were already out of production (Phenom X2 unlocked to X4 and Radeon 5850), i got a refund on both.
The issues were: Dead fan on the 5850 (dunno why a refund, but i won't complain), and Phenom II was causing freezes - after testing on a second PC with Prime95, turned out one of the standard cores was faulty (one of the original X2 cores, so RMA applicable). None of the issues were caused by PSU to my knowledge, and the machine worked flawlessly until then. I've actually borrowed a X4 965 and a Radeon 5830, as I’ve needed the machine for work. Everything worked flawlessly with the borrowed stuff too. I had to wait around 1 month to get the actual refund, and had to return the borrowed stuff.

As such, given that i use my workstation for both work and recreation, I’ve decided to get the new Vishera CPU (FX-8320) and a Gigabyte 7950 3 GB graphics card. Got my order the next day, and got the stuff installed.

Here's what's in my PC besides the GPU and CPU at the moment:
MB: ASROCK 970 Extreme 4 with 2.30 BIOS;
RAM: 3 x 2 GB DDR3, Kingston;
Several 120mm fans (5 in total) and one 90 CM on the CPU (not the stock cooler, a Pentagram Alpaya, quite old cooler, but worked fine on the Phenom II)
2 x 3.5' HDD's, Samsung 1 TB and 500 MB
1 x SSD drive, Crucial M4 64GB
A few USB devices, Keyboard, Mouse, WIFI, Card Reader, sometimes a pen drive.
And last but not least:
OCZ ModXStream PRO PSU - 500 W - 432 W on the 12V rail, 12V rail is split into 2 x 18A
OS: Windows 8 Pro x64

Below the PSU's card:

http://www.ocztechnology.com/images/awards/mxsp_wattage_charts.jpg

500W

So, we've booted up the PC after installing everything, and at first it did not boot. Every fan was spinning but the monitor was blank (no signal). A quick CMOS Clear later, i got it running. Everything seemed fine, the temps were a bit high (~ 57/core when gaming). I went on to play some Battlefield 3, Metro 2033 and the new 3dMark - everything seemed fine, no issues.

But the machine seemed to retain some issues when booting up. Usually it boots and reboots fine. However, from time to time, it won't boot at all, just once again, everything is spinning, but No Signal. I've noticed that when i disable Turbo Core function in BIOS, the issue appears less often. Other observations - When i get the issue, i shut down, wait a few seconds, boot up and it usually works correctly. However, when i had Turbo Core enabled, it seemed like the PC was emitting some weird sounds (like, somewhat high frequency clicking, audible but quite silent - not PC Speaker) during the boot. The clicking seemed to come from somewhere between the PSU and GPU, but I could not locate the source. The clicking sound stopped when the OS launched, but if it started CoreTemp tool, I’ve noticed that for several seconds after boot, the CPU was working with random frequencies that were exceeding specifications (on all cores the speed was 3700 to 4000). After a while the speed went to idle 1300. I've kept CoreTemp running, and played some battlefield again. All cores were working equally on 3500 speed, no exceptions. I did not get a single BSOD/freeze/unexpected reboot on this rig, if i have problem, it's during boot. If it boots, it works fine, regardless if it play games, work with Excel, Access, Photoshop, perfect.

One more thing. This CPU does seem to behave differently on the ASROCK board. It gets quite hot (up to 55-59 degree Celsius) when I’m in BIOS (this seems to be MOBO sensor value, not the one built into CPU, but still. When I get off the BIOS and launch the OS, CoreTemp tells me that cores have 25C and the MOBO sensor 34C, so the temperature drops when I get to OS.

I've tried to use some online tools to measure what PSU would this rig need, and i got various results, ranging from 511W to 614W. That's why if I had to shoot at something, I’d shoot at the PSU... However, one thing confuses me. Wouldn't lack of PSU power cause restarts when playing games/etc. instead of lack of boot?? I mean, as far as I’ve seen, GPU is at low power when booting, so I’d assume CPU would have plenty even to start with BOOST, and I’d get errors when playing games...

Is the current PC too much for the PSU? I really need the PC for work. I can afford buying another PSU (will look through the forum to check which one), and should be able to sell the old one (it does not seem faulty, just overloaded imho). I need to make sure though. I do have some experience with PC's, but not with PSU's. Maybe it's the MB... Asrock 970 Extreme 4 is said to be working fine with this CPU according to Asrock's website and various comments...

I did run a Prime95 test on the CPU, ran it for about 5-8 minutes - no errors. I did not want to run the test longer, since I’ve just wanted a quick test.

I apologize for the post being confusing, and for any grammar errors I did not pick up. It's extremely late at my place, but I really need to do some work on my project over the weekend. Tomorrow's the last day I can eventually make any purchase. I was going to do some work regardless of the issue, but then I got worried that the PSU might fry my new equipment, and that would be even worse...

EDIT : The buzzing sound seems to be caused by the freaking WindForce cooler on the GPU. disappears when system loads, since the card's cooling slows down. Disappeared completely (for now) when i set the cooler of GPU to 100% for a minute or two, then slowed it back to defaults.
This got me thinking though. Is it possible that the GPU boots in Performance mode like the CPU? That is the cause of GPU cooling working on higher speed?
Edited by shajs - 2/15/13 at 8:19pm
post #2 of 14
From everything gathered in your post, you certainly made it longer and more complicated than it needs to be.

Your PSU seems to have enough power for your components.
But it certainly could be making less power than rated, as its not the highest quality.

Also, playing games will not stress your computer to 100%.

The GPU buzzing is probably not the cooler.
It's called coil whine, which is common in AMD cards. At least current gen.

The computer having trouble turning on should be a problem with your power supply.
I suggest you go buy a good 550w power supply from a store near you. And if it turns out to not be an issue with your power supply, then you can just return it.
BUT.
....................................................................................................................................................................................................................................
Also, did you overclock the 8320 and or 7950? If you did, then 500w is not enough. Its only enough if the 7950 and 8320 are stock.
And you will have to buy a 600-700w depending on your overclocks.
If you're in the U.S, here's a good 650w,
Bronze and Gold Rating depending on what you want to spend, also the gold rated is capable of crossfire and is modular.
..................................................................
Rosewill 650w Bronze: http://goo.gl/OHRis
Rosewill 650w Gold: http://goo.gl/rCU0z
If it still has trouble then it may be the motherboard.
And you can RMA it to ASRock. Tell them its having trouble booting up sometimes, and you've tried a brand new power supply *With more power than your system needs* and it still has the same issue.
Edited by Traphix - 2/16/13 at 1:48am
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post #3 of 14
It's solid. Even with overclocks imo.
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post #4 of 14
You don't know how much extra power it takes to overclock do you ^.
Especially on AMD products which draw more power already than Intel/Nvidia, they're going to gulp down more overclocked.

An 8320 overclocked with .2 more Vcore will draw almost double power..
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post #5 of 14
Quote:
Originally Posted by Traphix View Post

You don't know how much extra power it takes to overclock do you ^.
Especially on AMD products which draw more power already than Intel/Nvidia, they're going to gulp down more overclocked.

An 8320 overclocked with .2 more Vcore will draw almost double power..

Yea... I'm dumb... You're right... -_-; Don't make assumptions that I'm ignorant just because I have intel in my rig.
I've owned a 955 before and overclocked it on 2 different systems with two different heatsinks and am familiar with the following.

http://www.overclock.net/t/1126863/real-world-power-usage-user-submitted-values/0_100

I read that I have a ballpark.
Quote:
FX-8120 @ 5.0GHz + 6850 @ 1000MHz @ 1.275V

Furmark Only: 382 Watts. -> 80% = 305.6W
Prime95 and Furmark: 632 Watts. -> 80% = 505.6W
Game (Saints Row 3 Ultra): 310 Watts. -> 80% = 248W
Game (BF 3 High): 374 Watts. -> 80% = 299.2W
Bench (3D mark 11 combined test): 385 Watts. -> 80% = 308W

That has about 200w headroom for a more powerful graphics card. And doesn't Bulldozer consume more power than Vishera? And I don't think he's going to be using the same amount of power as an 8120 @ 5.0GHz... A Vishera at 4.7-4.9GHz should consume a little less power.

The gaming shows 300w max, upgrading from a 6850 to a 7950 would not consume more than 200w MORE of power even with decent overclocks.
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post #6 of 14
Thread Starter 
I did not OC, but Gigabyte did, GPU-Z says 10000 MHZ core and 1250 mem.
post #7 of 14
@Flashfir, I have no clue what you're going on about. I used a reliable PSU calculator for the power requirements of his system. kookoo.gif
Which also has an accurate power requirement for cpu overclocks.

And OP, if you haven't overclocked, then your only problem is your psu, go to the store and buy a 500-550w psu, and if it has the same issues, then you need to RMA your motherboard, and you can return the psu.
If it solves it, then you have a bad psu.

EDIT: But if you want to overclock, see one of the PSU's I linked in my prior post.
Edited by Traphix - 2/16/13 at 2:36am
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post #8 of 14
Thread Starter 
1000, not 10000 mhz, typo, apologies, i wrote that from phone. Anyway, i went to the shop where i got the CPU and GPU. They've agreed to lend me another OCZ for testing, this time a 650W ZS series. We've agreed, that if it solves the issue, ill return the OCZ and order something actually decent. It has much stronger 12V rail, one rail but more than 40A. I'll check the behavior, and llet You know how it works. I guess given that today's PC's use 12V for most tasks, old OCZ was weak, only 430W max power on that rail. This one has more than 100W more max power on 12. I'll need to look for something with a powerfull 12V if this works.
post #9 of 14
Do you prefer OCZ or something? I've never looked to them other than for SSDs, and only the recent ones. The old ocz ssds had lots of issues.

Just asking.
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post #10 of 14
Thread Starter 
Not really. It's just that it was the only psu with decent wattage they had in stock atm. As said if it fixes the problem ill look for a decent corsair or enermax or something. Will browse the forum im sure ill find something suitable. Again written from phone dont mind the typos.
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