e7400 vs e6750

[ochadd]

Would going from a conroe to wolfdale with higher clocks be a decent trade off of the 1MB cache loss for gaming?

My motherboard will do atleast 425/1700 bus speeds but the cpu is limited to 3.4 in the summer and 3.6 in the winter. I can swap it out for an e7400 at no cost. This would likely leave it up to the processor but that's 4.4ghz assuming the processor is worthy.

Going to see how far it will go regardless but curious if you folks would make the swap if the e7400 hits 4ghz?

 

[fffblackmage]

If you can hit 4GHz, I'd say that's worth losing just 1MB of L2 cache.

I still haven't budged from my E6320 cuz I can't upgrade without some cost. T_T

 

[E4300]

In an instant if "no cost". E7400 should be able to run at 3.6GHz with 1.36V in BIOS. A decent chip can break 4.0GHz @ 1.36V BIOS.

 

[error8]

Get it, if it's a no cost situation. 4 ghz is attainable, with luck, but I'd say that 3.8 ghz is granted, making it faster then your current e6750 at 3.4 ghz.

 

[ochadd]

Still toying with it to find the max but so far:

CPUID validation

4.126ghz
393x10.5
1.36 vcore with a setting of 1.37 in the bios
1.2 vtt/fsb term
1.25 NB
1.6 Pll

Bored watching stability tests... Orthos stable 10 minutes and counting.

 

[E4300]

My R0 E7400 is good up to 4.2GHz (1.32V CPUz load) under OCCT, Prime95, and 1/2 hour Linpak. Peak temp is 52-62C @ 75F ambient with Big Typhoon. VTT, NB, and SB at stock. 1M SP in 12.296 sec.

 

[ochadd]

Originally posted by: E4300
My R0 E7400 is good up to 4.2GHz (1.32V CPUz load) under OCCT, Prime95, and 1/2 hour Linpak. Peak temp is 52-62C @ 75F ambient with Big Typhoon. VTT, NB, and SB at stock. 1M SP in 12.296 sec.

I have a feeling this one is good for 4.2 or better but it's going to require some additional voltage. Can't get it to run Orthos for more than 15 minutes before I get a BSOD and reboot. Gets 10-15 minutes into Orthos at both 4.2 and 4.1. Just cranked up the voltage to 1.38 and giving it another go. Temps are steady @ 60c under full load with a tuniq tower on it.

Really going to pour the coals to it. I got it to the Windows loading screen @ 4.5 but couldn't get CPUZ open fast enough to validate. Got some confidence in it though.

Edit: Think I'm going to settle for 4.1ghz for the night. It's a 700mhz jump from where I was and a 1.3 ghz OC. It's a personal best. Idles @ 30c, load is 61c. Need to ramp up the FSB and memory to where they were with the 6750. Would really like to get a 4.5ghz validation though so I'll have to check the bank account and see if I can afford to fry one

 

[ochadd]

Ok this little processor is really becoming a pain in the ass. It has no problem getting into Windows and running Orthos for 10-40 minutes at pretty much any frequency I've tried. 4.0, 4.1, 4.2 they all fail out but I've managed to get rid of the BSOD and reboot with some extra voltage. Anywhere from 30 minutes to 2 hours stable.

In my experience if I can get a processor to run stable for any amount of time that ghz target is doable with enough volts and other settings. Enabling 1.425 vcore and LLC seems to give me the best results at 400x10 with it reporting 1.392 in CPU-Z. Temps hang around 60c. From what I've read it seems accepted that 1.4 vcore is accepted as a reasonable max for 24/7 operation on these and with LLC enabled and 1.425 vcore in bios I could be on dangerous ground.

If my board would do 450 fsb with one dual core processor is it not expected to do 400 with another? When starting this I pretty much eliminated the motherboard as a variable since it was 24/7 stable at 450 fsb for better than two years with the current settings. Is there any reason to suspect that it wouldnt be able to do 400-425 going from Conroe to Wolfdale?

For testing stability is there a certain vcore I should consider the wall? 1.5 and it goes pop? I'm willing to accept a year cpu lifespan but not two days.

CPUZ validation

Edit: Lasts 30-45 minutes in Orthos @ 4.2 with a 1.45 vcore. It's pushing 68c with small FFT test and that's just too warm for my tastes. Going to 1.5 to see what I can get for a validation. More than likely settling for something a little less ambitious for 24/7 usage.

 

[E4300]

That CPU is out of gas ~3.9-4.0GHz. My chip is stable @ 4.2GHz/1.32V CPUz load, and 4.3GHz/1.36V CPUz load. No need to push these 45nm processors to 1.4V for another 100MHz of core speed. Max Prime95 load @ 4.3GHz is 55C (75F ambient).

45nm chips will gain about 50MHz per 20mV increase in CPU core. The CPU is at the point of saturation when you cannot achieve stabilility with much higher Vcore.

I would limit CPU core voltage to 1.4 in BIOS. I'm not a fan of LLC, which may add an additional 50-80MHz to the overclock. 1.2V idle and 1.32V load work well for me. The system draws 50W @ idle and 116W Prime95 large load (calibrated power meter).

 

[ochadd]

Got 4.4ghz @ 1.5 vcore
CPUZ Validation

That's as far as I'm taking it. Can get it nice and stable @ 4.1 with 1.4 vcore and I can live with that.

 

[chuckm]

Mine needs 1.4V to hit anything above 3.7, runs at 3.6 24/7.