e6850 help, second core fails on Prime 95

[Granite3]

Just picked up an e6850 to replace my Q9450. (Getting ready for I7).

Reset my 790i board to default, install the e and fire it up. Check temps, voltages, etc, burn it in and run Prime 95 on the stock 3.0 speed.

The second core fails at the 4 minute mark, so I bump the voltage a tick, retry, same thing. Bump the speed to 3.1, same result, 3.2, same, etc through 3.8. Down to a minute at this speed.

Add NB and fsb voltage same thing.

First core continues its worker thread, and ran all night till I shut it off this morning.

Same results with Orthos. CPU-z shows proper voltage, speeds, etc.

Any ideas?

It is a retail cpu with a 3 yr warranty, so maybe send it back, but do not want to go without it.

 

[htoonthura]

Just picked up an e6850 to replace my Q9450. (Getting ready for I7).

Reset my 790i board to default, install the e and fire it up. Check temps, voltages, etc, burn it in and run Prime 95 on the stock 3.0 speed.

The second core fails at the 4 minute mark, so I bump the voltage a tick, retry, same thing. Bump the speed to 3.1, same result, 3.2, same, etc through 3.8. Down to a minute at this speed.

Add NB and fsb voltage same thing.

First core continues its worker thread, and ran all night till I shut it off this morning.

Same results with Orthos. CPU-z shows proper voltage, speeds, etc.

Any ideas?

It is a retail cpu with a 3 yr warranty, so maybe send it back, but do not want to go without it.

Am i missing sth? you replace q9450 with e6850? Anyway... what are the rest of the system specs?

 

[cjl]

Why did you replace a Q9450 with an E6850?

 

[houstonserenity]

RMA !!

 

[one-shot]

This sounds, very very bad. A Q9450 for an E6850? I'm confused...really am. My E6750 is humming at 3.7Ghz rock solid and your e6850 (if that is what you're actually using) should clock a little higher than mine with the help of the higher multiplier.

 

[megamanx00]

Sounds to me like your second core can't run at the specified speed. Did you fry your Q9450 or something?

 

[jsc]

"The second core fails at the 4 minute mark, so I bump the voltage a tick, retry, same thing. Bump the speed to 3.1, same result, 3.2, same, etc through 3.8. Down to a minute at this speed."

???

If the CPU fails at 3.0 GHz, why try higher. You know, or should know, that it's going to fail.

Put everything back to default. If the CPU fails, return it.

 

[Granite3]

I replaced the Q with the E as my gaming needs are handled easily with the E and the Q still has a nice resale value, allowing me to amass some funds for the move to the I7 platform.

I have had instances in the past where instability at the lower clocks went away at higher ones (within reason). A Q6700 I had was unstable under 3.0, but ran rock solid at 3.1.

Rest of stuff -
Q-9450 @ 3.6, EVGA 790i board, 2x GTX 260, 4 gigs OCZ Gold pc1600, WD 640,2x Seagate 320 SATA, X-FI gamer, 2x dvd/rw, OCZ GameExtreme 850 psu, TT drivebay 250 GPU PSU, Antec P180B case, Swiftec watercooling.