E8400 @ 4GHz (500x8) on air

S

ShaidarHaran

hardware monkey
Veteran
I've finally stabilized my system at the desired CPU clock of 4GHz, and was able to pull it off with a 500MHz FSB and 1:1 memory speed even! Took some extra cooling on the RAM and northbridge, and a heck of a lot of volts just about everywhere, but it's not hot and it's stable so I'm happy.

Here's a screenshot showing FAH SMP stability and Super Pi 1/32M times for anyone that cares:
spi4ghz.jpg
 
Had it @ 4.25 (8.5x500) but got greedy with memset and changed a timing I shouldn't have (I think) so I'm having to reload Windows here, but I may have borked my RAM already in which case I need to get yet another kit :p

Anyway, benching @ 4.25 was at least SuperPi stable (didn't have time for anything else) and pulled off 10.656s in 1M and 12:31 in 32M. Very nice.
 
E8400 is a 3ghz processor.

Most folks have found that heat never becomes the bottleneck, even on air. The chip just "stops" around 4.3->4.4Ghz no matter what voltage you feed it. I keep mine at 9x482 with ram at 1:1 because that's the maximum ram and FSB speed I can keep while using the tRD 7 strap and 4-4-4-10 timings.

These 45nm parts are friggin awesome.
 
ShaidarHaran said:
Took some extra cooling on the RAM and northbridge, and a heck of a lot of volts just about everywhere, but it's not hot and it's stable so I'm happy.
Click to expand...

How high you running the Vcore? I wouldn't be going past around 1.4V if I wanted the chip to last.
 
Most of 'em will do 3.3-3.5 on stock voltage as far as I've seen. I'm not sure about Shaidar's chip, but mine will do ~3.4 on stock voltage (9 x 377 @ 1.11250) and ~3.65 on the max VID setting (9 x 405 1.225)

4.0Ghz came in at 1.3625v, and my everday 4338Mhz is 1.4875v. If it dies, no biggie, it'll just mean it's time for quad :D All the voltages above are in-bios settings, the actual voltage is typically quite less. Example I can give straight away is my everyday 1.4875v in bios typically results in about ~1.42v actual at idle and ~1.38v actual under load.
 
Jeez, what mobo are you on with that kind of Vdroop? My IP35-E had horrible Vdroop almost identical to what you described before I flashed the latest beta BIOS. Now Vdroop is no more than .02.
 
Gigabyte X38-DS4.

It doesn't really bother me that much; I can do 575FSB without even touching vMCH or vTT on this board. And it stopped at 575FSB because my ram couldn't go any faster. It would post 600FSB without issue, but the memory was so unstable that it wouldn't even load memtest right 80% of the time no matter what the timings or voltage...

Not gonna complain for DDR2-800 sticks though :D That was on my old E6850 using the 6x multiplier; my E8400 hates front side bus in excess of about 530Mhz.

There is a BIOS update out there for this board (F2 = newest, I'm on F1 = original), so I might check it out later. But hell, it works good as-is, so I'm not really worried.
 
Albuquerque said:
E8400 is a 3ghz processor.

Most folks have found that heat never becomes the bottleneck, even on air. The chip just "stops" around 4.3->4.4Ghz no matter what voltage you feed it. I keep mine at 9x482 with ram at 1:1 because that's the maximum ram and FSB speed I can keep while using the tRD 7 strap and 4-4-4-10 timings.

These 45nm parts are friggin awesome.
Click to expand...

Only a 1Ghz overclock on a 45nm processor? Pfft. I got that on my 65nm Q6600 B3 stepping processor, air cooling, 100% rock solid stability in Prime95. :D

2.4Ghz --> 3.42Ghz. :p
 
That's actually 1.3Ghz if you were talking about my overclock, and I stopped there because that's the sweet spot for ram performance.

If you want to have an all-out OC e-peen contest, then you can chalk me up for 4572Mhz (9 x 508) with Prime95 stability. But I wouldn't run that daily, simply because there's better overall system performance with a few hundred less CPU megahertz.
 
Pfft. Whatever, when this puppy hits 88 miles per hour, you're gonna see some serious shit.

:D
 
Where's that stupid picture with the woman:

Oh noes, my megahurtz haev ben stoeled!!!1oneEleventy1!
 
LOL, if I had a decent camera on me I'd take pics and upload them right now. My system is as cool on air as the water-cooled system of one of the other participants in the LAN party I'm currently attending :D
 
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