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Something wrong or faulty CPU?

post #1 of 66
Thread Starter 
Hi all,

I've just put together a very nice rig (so I think anyway). Throw on the i7 3770K with stock cooler and thermal paste and have it running Prime95 on small FFT.

Under no OC, just running stock settings, the temperature rose to the 90s within the first 10 minutes of the test.

Remember this CPU has not been delidded, and I've tried both the thermal paste that came with the heatsink, and some aftermarket Arctic MX-4.

Does this sound normal? Or is something completely wrong? My core voltage is at about 1.256v to 1.264v.

Cheers,
Brendan
post #2 of 66
Before you toss the cpu do some troubleshooting. Make sure that you are applying the thermal paste correctly. Completely clean the surface of the cpu a lintless cloth and isopropyl alcohol. If you know you did that, use a different program to see if it isn't a program glitch on Prime95.
post #3 of 66
Thread Starter 
I did remove the old paste with isopropyl, but using tissue paper rather than microfibre. I will use microfibre when i get home tonight to see if it makes that much of a difference.

After removing the old paste, I used some Arctic MX4 using the line method, but the temperature is about the same. Not sure whether I can contact intel or how to contact intel, they haven't been responding on the live support in intel website.
post #4 of 66
There isn't going to be any appreciable difference between wiping it with a tissue and something else, certainly not enough to make the kind of temps you are seeing. Make sure you have the cooler fully seated and the fan is running at full speed, but I think the obvious issue is that the voltage is seems too high for stock. Did you load the optimized defaults in the BIOS, or did you try to run some kind of auto-overclock on it?

The stock cooler isn't much good, but it should be better than 90C at stock. Double-check the voltage settings in the BIOS.
post #5 of 66
Thread Starter 
I loaded optimized default yes. Do I need to flash the bios to a higher version?

I've tried both enabled and disabled HT, both run at about the same temp.

Also, how do I know whether the CPU fan running at full speed or not?
post #6 of 66
honestly, i wouldnt try to push that cpu with prime 95 on a stock cooler.

seems like prime95 will force the life out of your cpu, and you are not the only one thats hitting 90 celcius on stock cooling.

http://www.tomshardware.com/forum/341561-28-temps-3770k

Try Intel Burn stability test on your stock cooling.
post #7 of 66
Quote:
Originally Posted by brenchen View Post

Also, how do I know whether the CPU fan running at full speed or not?

Normally when you first power on the system the fan will briefly run at full speed, and then slow down. Just kind of play it by ear and see if it spins back up to something approaching that level under load. You can check the RPM in something like HWInfo, but you should be able to hear whether it is spinning up or not.
post #8 of 66
Thread Starter 
I thought the startup fan speed is being overvolted as the system boots, therefore it spins so much faster? But no, it wasn't going at that speed by a long shot! I believe my case fans are quiet (they are all custom using Noctuas and Gentle Typhoon for my rad). But I can switch them all off to hear the CPU fan?
post #9 of 66
The optimised default BIOS setting is far from optimal. It has set your vcore at 1.25v. There are some people who run in excess of 4.8ghz with 1.25v. I would suspect this is far too much for the standard 3.5ghz (or 3.9ghz with turbo) on any Ivy CPU. I personally would lower your vcore to 1.1v and then run prime. If you are stable then lower it a little more (and by little I mean its smallest increment) and test again. If its not stable then raise vcore and test again.

Not what you would expect to have to do out of the box but as i am sure you will here time and time again every chip is different. Prime but a load on your CPU that will never be replicated with any kind of daily use and the fact is it is still running within tolerance. I also thought 1.2v was the default voltage for these so the extra 0.5v above an already unnecessary voltage wont exactly be helping. Lower that voltage or get a new cooler and unleash that beasts full potential. The stock coolers are pretty poor. They do the job they are designed to which is keep it within tolerance when at stock clocks and voltage. Nothing more.
Tevatron K
(15 items)
 
 
CPUMotherboardGraphicsRAM
2600K @ 4.8ghz Z77 Sabertooth R9 290 8GB Samsung 30nm @ 1866mhz 
Hard DriveHard DriveOptical DriveCooling
M500 240GB SSD 3x 3TB HDD's Sony DRU-V200S Custom water cooling 
OSMonitorKeyboardPower
Windows 7 64bit QNIX 27" 1440p @ 96Hz Ducky 1008 BeQuiet 1200w 
CaseMouseMouse Pad
HAF 932 Logitec G5 Table top 
  hide details  
Reply
Tevatron K
(15 items)
 
 
CPUMotherboardGraphicsRAM
2600K @ 4.8ghz Z77 Sabertooth R9 290 8GB Samsung 30nm @ 1866mhz 
Hard DriveHard DriveOptical DriveCooling
M500 240GB SSD 3x 3TB HDD's Sony DRU-V200S Custom water cooling 
OSMonitorKeyboardPower
Windows 7 64bit QNIX 27" 1440p @ 96Hz Ducky 1008 BeQuiet 1200w 
CaseMouseMouse Pad
HAF 932 Logitec G5 Table top 
  hide details  
Reply
post #10 of 66
Thread Starter 
Quote:
Originally Posted by Jokah View Post

Lower that voltage or get a new cooler and unleash that beasts full potential. The stock coolers are pretty poor. They do the job they are designed to which is keep it within tolerance when at stock clocks and voltage. Nothing more.

I have an XSPC RayStorm D5 kit on EX360 setup push and pull. It's not connected yet, I just want to run the stock to see how it goes.

So two profiles
- OC multiplier without adjusting the vcore until it gets unstable, then chuck on the WC loop and continue pumping the vcore? Or
- Reduce vcore on stock cooler, then do the whole OC process until the stock cooler can't handle it, then I chuck on the WC loop and keep pumping?
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