**Official e8400/e8500 Retail OC Thread

[So3oL4Nu]

Prolly ya Vcore is too low, why don't ya run eg 9 x 444 to get 4ghz and see if you can do it with ya current Vcore 1.392 idle... Ya CPU already needs 1.26 under load for 3.6Ghz that's not a good sign at all... also you provide us with zero info on ya hardware... we really got nothing to work with

My hardware is next:

Asus P5KC
Corsair 2x1 XMS2 DHX 800mhz 4-4-4-12 / 2.1

Thats is all you need, right ? ...

Btw...my batch is not a good one you say? ...

[Kilyin]

You might want to read the whole story before you open your mouth.

You might want to go eff yourself with that attitude kid. I asked a simple question... and I've read this entire thread. A 9.5 multi doesn't prevent the use of a divider with DDR2, which is what you implied.

Don't spout off.

[Telo]

You might want to go eff yourself with that attitude kid. I asked a simple question... and I've read this entire thread. A 9.5 multi doesn't prevent the use of a divider with DDR2, which is what you implied.

Don't spout off.

Hmm, let's analyze that one a bit. The max DDR2 can probably achieve is about 1333Mhz in some cases; which is equivalent to 333FSB. If he is running his CPU at 3.6Ghz [400FSB], which means that the RAM is already on a divider [so right off the bat you are wrong with your assumption that I said he can't use a divider with DDR2]. Now, my advise was to go higher and apply a divider [thinking he has DDR3]. So let's do that shall we?, let's say he took it up to 450FSB, that would mean 1800Mhz on the RAM, something DDR2 definetly cannot handle, so the next level down would be 1350Mhz [1800 - 450] which is basically a lot faster than his RAM can handle still; which brings it to the next level, 900Mhz, a range that more than likely he will not be happy with, hence me saying nevermind.

[zlojack]

You can get 900, 1080 or 1125 out of a 450 FSB, all of which are reachable by good DDR2.

[Telo]

You can get 900, 1080 or 1125 out of a 450 FSB, all of which are reachable by good DDR2.

What did you set the FSB strap to get the 1125Mhz?

[zlojack]

What did you set the FSB strap to get the 1125Mhz?

266 I believe. the 4:5 divider. (I'll have to check when I get home to my rig, I'm at work right now.)

I think it gives 1128MHz in my bios.

[Caveman787]

Umm I think you guys are looking at memory wrong.

The fsb is half that of the speed of the memory.

ddr2 900 is 450 fsb....Idk how your comeing up with he other idea.

[zlojack]

Umm I think you guys are looking at memory wrong.

The fsb is half that of the speed of the memory.

ddr2 900 is 450 fsb....Idk how your comeing up with he other idea.

You can run your memory on a divider to make it run faster than your FSB.

4:5 Ratio 450/4x5=562.5 DDR2 = 1125 MHz

[Telo]

266 I believe. the 4:5 divider. (I'll have to check when I get home to my rig, I'm at work right now.)

I think it gives 1128MHz in my bios.

That's what I thought. My calculations were based on a higher strap.

[zlojack]

That's what I thought. My calculations were based on a higher strap.

333 Strap for the 1080 MHz I believe. Still pretty good and more reachable.

[Telo]

Umm I think you guys are looking at memory wrong.

The fsb is half that of the speed of the memory.

ddr2 900 is 450 fsb....Idk how your comeing up with he other idea.

The "double FSB" formula mainly applies to DDR, not DDR2 nor DDR3. We now have dividers that allow us to manipulate the date rate. The highest [sold] RAM is DDR3-2000, which is based on a 500FSB. My current RAM is rated for 1866Mhz [467FSB], but I run it at 2000Mhz with my 500FSB.

[Telo]

333 Strap for the 1080 MHz I believe. Still pretty good and more reachable.

True, but I believe he said his RAM wouldn't go any higher and it was set to 10066Mhz [if I'm not mistaken]. It's more of specific circumstance advise . Like my BlackOps for instance, it has a wide array of dividers, ranging from 1:2 all the way to 1:4 CPU 400 [with 266, and 333 in before it]. By nevermind, I basically meant that he would lose too much performance [IMHO] by lowering the divider; and I don't like telling people to go slower than they can unless going faster causes them not to run at all.

[Triton]

take your memory thang elsewhere, it doesnt belong in e8400 max oc, plz

[rob[GL]]

Just picked up another E8400... Q815A404

I'm running Prime95 right now... 1.25v (stock volts) and 450x9 (4050MHz) on aircooling and 67c is the max temp so far


My last cpu need 1.425 to reach 450x9... Glad to see new CPU overclocking so well with such low volts...

I will try to reach higher clocks later tonight.

[Telo]

[C-N]

Picked up a cheap E8500 this week & its doing well.

E8500 Q807A273 @ 4GHz 1.25v CPU-Z Under Load.

DFI LP UT P35 / Thermalright Ultra Extreme 120.

9 1/2 Hours Prime Blend.

CN

[Leeghoofd]

My hardware is next:

Asus P5KC
Corsair 2x1 XMS2 DHX 800mhz 4-4-4-12 / 2.1

Btw...my batch is not a good one you say? ...

Well sorry to tell you but no it isn't, 1.26V under load for 3.6Ghz is really not good mate... that will need 1.4 and more for 4ghz operation... if I was you I would settle for 9 x 425 and tweak the ram timings and co...


OC list updated thx for your results

[rob[GL]]

So... I went out to a food eating competition, when I got home, my prime95 had crashed after 2.5 hours.

Bumped the voltage to 1.28v and prime95 ran overnight while I slept with no issue. I'm wondering how much higher I can push it, I don't want to get too crazy with the volts. I'd like to stop at 1.4v - but will I acheive any significantly higher clocks?

Only time will tell...

[Prince21]

Can someone help me overclock a nice E8500, not common this chip, this is what I have: http://valid.x86-secret.com/show_oc.php?id=384956

Please provide me with some of your details, I have Asus p5E not flashed to rampage yet only if needed. I have tuniq tower I need someones values who has similar system to test and try out, sorry for being a newbie but i hope to expand knowledge.

[4Qman]

just got round to setting up a e8500 on a friends pc

IDLE temps are 42oC @ 1.32v @ 4ghz.

LOAD "dual prime" is 60oC

this seem ok on Tinuq tower

[Telo]

So... I went out to a food eating competition, when I got home, my prime95 had crashed after 2.5 hours.

Bumped the voltage to 1.28v and prime95 ran overnight while I slept with no issue. I'm wondering how much higher I can push it, I don't want to get too crazy with the volts. I'd like to stop at 1.4v - but will I acheive any significantly higher clocks?

Only time will tell...

It all depends, some CPUs require a hell of a lot of voltage after a certain point, rendering that extra OC not worth it sometimes. In my case I can do 4Ghz at 1.20v, but for 4.25Ghz I needed to bump the voltage up to 1.30v; so you see a mere 200Mhz OC took .10v, meanwhile the original 840Mhz OC only took .0125v from the VID. Now, whether my CPU can run its rated speed with lower voltage than the VID, I do not know nor care about so I calculate the required voltage from my OC original OC as that.

[Telo]

just got round to setting up a e8500 on a friends pc
IDLE temps are 42oC @ 1.32v @ 4ghz.
LOAD "dual prime" is 60oC
this seem ok on Tinuq tower

I guess it would depend on your ambient temps. I see a whole bunch of posts on your profile, so this may sound like a stupid question on my part, but have you tried remounting the heatsink to see if the temperature goes down?

[4Qman]

I guess it would depend on your ambient temps. I see a whole bunch of posts on your profile, so this may sound like a stupid question on my part, but have you tried remounting the heatsink to see if the temperature goes down?

never a stupid question mate.

But yes i have, ill have a read through again and get a better understanding on what people are achieving,

[HDCHOPPER]

bahhahahaahahahaha eye see orthos doesnt read multi's well ...my aegis panel & orthos doesnt read multi's very well

[Leeghoofd]

At least it's better than with the MARS... Aegis only readout correct speed, multi's FSB and co were all borked... same for CPU-Z and co... some Beta biosses were better with the readouts, some messed it up again...