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Hot FX-8350 (in Prime95 only)

post #1 of 34
Thread Starter 
Hey guys, I'm doing searches all over Google and every hardware site I can find, looking for info on FX-8350 owners.

Here's my issue. I just bought an 8350, installed on an Asus M5A99FX PRO. I've had the system up and running for about a week, and it seems totally stable for gaming. I actually have the multiplier at 20.5 so CPU clock is roughly 4.2, not a major OC... and as I said, system has been totally stable in all games so far.

However... when I first put the build together, I tried running Prime95. While running prime, temperatures immediately skyrocketed, I think I saw 67C before I shut it down. There were no Prime errors, warning, or failures, but temps were ridiculous.

I am using the stock cooler, but I have read that other people ran Prime on the stock cooler and reported normal temps of 55-60C. Can anyone give me some insight as to why my temps, only in Prime, are so high? Is my CPU just defective and running hot? It doesn't appear to be hot in normal operation, I'm not at the PC now, so I can't give exact numbers, but I believe my idle goes as low as 32-35C, and my max load in BF3 or Starcraft II has never exceeded 60C.

Once I'm at the PC, I'll be able to post voltages and the other BIOS settings I'm using. Any insight would be greatly appreciated.
post #2 of 34
Depending on your voltage and bios settings it may be causing heat issues. Also check the thermal paste on the stock heatsink. It turns to concrete after a few hours. Be careful with removal.
post #3 of 34
Thread Starter 
Actually I immediately scraped off and thoroughly cleaned the stock thermal paste from the stock heatsink prior to installation. I applied AS5, spreading it over the CPU dye rather thinly. I've heard a couple different ways that people say is the best way to apply thermal paste, so re-seating the heatsink (using the 'single glob in the middle' method, where you let the heatsink squish the paste out) is my first troubleshooting step if I can't get any technical reasons.
post #4 of 34
different CPUs have different stock voltages. Plus air flow inside case & ambient temp.
You are overclocking your CPU so that does play into it. Are you running stock voltage on
your CPU (what is your VID). Try Prime with everything on stock (load optimized default in BIOS).

if you want to overclock your processor I would recommend an aftermarket heatsink right away.
True Spirit 120M $29.95 shipped would be a good starting place.

If you can spend a little more True Spirit 140 $39.95 or Macho Rev A $42.95 are great hsf
make sure you have room inside your case and it clears your memory (high profile memory)


PC Cooling Sale Round-Up
http://www.overclock.net/t/1367897/pc-cooling-sale-round-up
AR 5650
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AK 8320e
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Intel Core i7-6700K Kaby Lake Quad-Core Supermicro C7Z170-M LGA 1151 mATX MSI Radeon RX 480 GAMING X 4GB Team Dark 16GB (2 x 8GB) DDR4-3000 Model TDRED4... 
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AR 5650
(12 items)
 
AK 8320e
(12 items)
 
AR 1151
(7 items)
 
CPUMotherboardGraphicsRAM
Intel Core i7-6700K Kaby Lake Quad-Core Supermicro C7Z170-M LGA 1151 mATX MSI Radeon RX 480 GAMING X 4GB Team Dark 16GB (2 x 8GB) DDR4-3000 Model TDRED4... 
CoolingPowerCase
Scythe Fuma (SCFM-1000) Twin Tower EVGA 750 GQ, 80+ GOLD 750W, Semi Modular RAIJINTEK STYX Gold, Alu Micro-ATX Case 
  hide details  
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post #5 of 34
Quote:
Originally Posted by Heuchler View Post

different CPUs have different stock voltages. Plus air flow inside case & ambient temp.
You are overclocking your CPU so that does play into it. Are you running stock voltage on
your CPU (what is your VID). Try Prime with everything on stock (load optimized default in BIOS).

if you want to overclock your processor I would recommend an aftermarket heatsink right away.
True Spirit 120M $29.95 shipped would be a good starting place.

If you can spend a little more True Spirit 140 $39.95 or Macho Rev A $42.95 are great hsf
make sure you have room inside your case and it clears your memory (high profile memory)


PC Cooling Sale Round-Up
http://www.overclock.net/t/1367897/pc-cooling-sale-round-up

Excellent suggestion. But if you must run the stock heatsink for now then please post your bios setup. Also how many and in which way you have the fans oriented. Case as well.
post #6 of 34
Lower your voltage.

I have an 8320 with 1.325 stock VID and I have mine OC'd 4.1Ghz at 1.296 volts.
Movin' on Up
(23 items)
 
  
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AMD FX-8320 ASUS SABERTOOTH 990FX R2.0 MSI R7950-3GD5/OC BE Samsung 8GB DDR3-1600 (PC3-12800) 
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SAMSUNG SSD 840 Liteon IHAS 524 DVD writer  XSPC Raystorm CPU Waterblock (2) EK-PSC Adapter 90° G1/4 Black Nickel 
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EK Radeon HD 7950 VGA Liquid Cooling Block Alphacool NexXxoS XT45 Full Copper 360mm Radiator Swiftech MCP655 XSPC Single Bay Reservoir 5.25" 
CoolingCoolingCoolingCooling
(6) Swiftech Helix 120MM 9-Blade Z-Bearing Fan ... (10) XSPC G1/4" to 1/2" ID, 3/4" OD Compression... PrimoFlex Advanced LRT Tubing - 1/2in. ID X 3/4... (2) EK-PSC Adapter 45° G1/4 Nickel 
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Movin' on Up
(23 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-8320 ASUS SABERTOOTH 990FX R2.0 MSI R7950-3GD5/OC BE Samsung 8GB DDR3-1600 (PC3-12800) 
Hard DriveOptical DriveCoolingCooling
SAMSUNG SSD 840 Liteon IHAS 524 DVD writer  XSPC Raystorm CPU Waterblock (2) EK-PSC Adapter 90° G1/4 Black Nickel 
CoolingCoolingCoolingCooling
EK Radeon HD 7950 VGA Liquid Cooling Block Alphacool NexXxoS XT45 Full Copper 360mm Radiator Swiftech MCP655 XSPC Single Bay Reservoir 5.25" 
CoolingCoolingCoolingCooling
(6) Swiftech Helix 120MM 9-Blade Z-Bearing Fan ... (10) XSPC G1/4" to 1/2" ID, 3/4" OD Compression... PrimoFlex Advanced LRT Tubing - 1/2in. ID X 3/4... (2) EK-PSC Adapter 45° G1/4 Nickel 
OSMonitorKeyboardPower
Windows 7 64bit Samsung SyncMaster P2370HD  Logitech K300 Rosewill Tachyon-650 
CaseMouseMouse Pad
CoolerMaster HAF Stacker 935 Logitech Allsop 
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post #7 of 34
Thread Starter 
Okay, first thanks for all replies and suggestions.

My case...

http://www.newegg.com/Product/Product.aspx?Item=N82E16811146075

with: x3 120mm fans, and x1 140mm fan

120mm as intake in middle spot behind front panel
120mm as exhaust on rear slot
120mm as exhaust in rear-most top slot
140mm as intake on side panel

My BIOS settings...
Warning: Spoiler! (Click to show)

Edit: my actual settings differ from that screenshot only in the CPU ratio, which is set to 20.5 rather than auto, on my build

In fact these settings are straight from this thread:

http://www.overclock.net/t/1348623/lightbox/post/19033090/id/1227880

My concern is that people are overclocking WAY more than I am, and from what I have (and haven't) heard, don't appear to be having this temp issue with prime95.
Edited by N0Taqua - 4/2/13 at 1:13pm
post #8 of 34
My first guess is really go to be the paste is spread poorly in that it has a bubble or something. It seems like the most likely culprit. That and it is a stock cooler afterall.....
DEFCON-3
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Samsung 840 PRO 128GB Samsung 850 EVO 500GB Kingston HyperX 3K 128GB Kingston SSDnow 128GB 
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WD Caviar BLACK 500GB ASUS Blu-ray ASUS LightScribe SILVER ARROW SB-E 
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DEFCON-3
(22 items)
 
   
CPUMotherboardGraphicsRAM
FX-8350 (4.8GHz) Sabertooth 990FX (R1.01/BIOS1604) ASUS GTX 780Ti 2x8GB G.SKILL TRIDENT-X (2140MHz) 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 PRO 128GB Samsung 850 EVO 500GB Kingston HyperX 3K 128GB Kingston SSDnow 128GB 
Hard DriveOptical DriveOptical DriveCooling
WD Caviar BLACK 500GB ASUS Blu-ray ASUS LightScribe SILVER ARROW SB-E 
OSMonitorKeyboardPower
Windows 7 PRO 64-bit 3x ASUS VN248H (24" 1080p AH-IPS) Logitech G710+ Seasonic G-750 
CaseMouseMouse PadAudio
CM STORM:Trooper (DEFCON-3 MOD) Logitech MX Master Corsair MM600 CREATIVE Sound Blaster Z 
AudioOther
Audio Technica ATH-m50xbl Chill Factor III 
CPUMotherboardGraphicsRAM
AMD Athlon X4 880k ASRock A88M-G/3.1 ASUS GTX 660ti HyperX Fury 8GB 
Hard DriveOptical DriveOSMonitor
Crucial MX300 750GB LG Blu-ray Windows 10 P502ui-b1 
KeyboardPowerCaseAudio
Logitech k400r Rosewill Hive 550W ROSEWILL SRM-01 Vizio S4251W-b4 
CPUMotherboardGraphicsRAM
AMD Phenom II X2 550 MSI 770-C45 Sparkle GT 220 4GB Corsair XMS3 
Hard DriveHard DriveOptical DriveCooling
Western Digital 500GB Caviar Black Seagate Baracuda 1TB ASUS blu-ray Stock 
OSMonitorKeyboardPower
Windows 7 Proffesional  Acer 24"  Logitech Wave OCZ modXtreme Pro 600W 
CaseMouse
Cooler Master Centurion 5 blue Logitech LX8 
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post #9 of 34
I'll post some screens of my bios in a sec. I think your nb voltage is a little high.

Here they are if I can add them correctly lol.





Edited by IchibahnSLC - 4/2/13 at 1:25pm
post #10 of 34
Thread Starter 
Thank you for those shots,

first off, may I ask how I can take some of those of my own BIOS?

I will try some of your settings and tweak around with mine.

Also, with your OC, or even at stock settings, are you able to run Prime95? Indefinitely? What temps would you see if you did so?

Thanks again for these answers.
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