Overclocking an E8400 on Asus P5E3

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AMSA7

Honorable
Jun 26, 2013
21
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10,510
Hi there guys,

I am trying to overclock my E8400 and there I came out with some doubts.

The first thing that I am doing is trying to find the max for my memories. I've 4 sticks of 2GB from kingston (those cheap memory), rated at 1333Mhz. However the chips are the same as this memory: http://aphnetworks.com/reviews/kingston_hyperx_khx1600c9d3x2k2_8gx_2x4gb/2

I've already overcloked the RAM up to 1600 (FSB 400Mhz). I've drop the multi to 7x. The configuration you can see on the following pictures:

http://imageshack.us/photo/my-images/39/6s8n.JPG/

http://imageshack.us/photo/my-images/841/c896.jpg/

http://imageshack.us/photo/my-images/844/t7n8.jpg/

http://imageshack.us/photo/my-images/850/y3uh.jpg/

I don't know if I can go any further or not. If you notice, it has passed the memtest 86+ for 8 hrs, with those timmings and that voltage (1.56V).

I need your opinion please or suggestions.

To finish, I want to know how can we get a 1:1 ratio. I've read lots of info but still can't understand.

Kind regards.

 
Solution
D
Leave the RAM alone. Core2 was designed with DDR2 in mind. Your CPU has a 9x multiplier ( I ran one at 4.050Ghz for over 2 years ) and with DDR2 800 you would get a 1:1 RAM/FSB ratio at 3.6Ghz. I ran mine with DDR2 slightly overclocked to 900Mhz with a 450FSB for a 1:1 FSB/RAM ratio. With DDR3 you would need to underclock your RAM for that 1:1 ratio. There is no need for that. So since your RAM is already fine get rid of the RAM overclock for maximum stability. Then with the multiplier at 9x just increase the FSB. With good cooling 450FSB is probably fine. That will give you 4Ghz ( 4.050 to be exact ) and that is about what the E8400 is capable of safely for long term use. You might get a little higher. 4.2Ghz was about the max.
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Deleted member 217926

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Leave the RAM alone. Core2 was designed with DDR2 in mind. Your CPU has a 9x multiplier ( I ran one at 4.050Ghz for over 2 years ) and with DDR2 800 you would get a 1:1 RAM/FSB ratio at 3.6Ghz. I ran mine with DDR2 slightly overclocked to 900Mhz with a 450FSB for a 1:1 FSB/RAM ratio. With DDR3 you would need to underclock your RAM for that 1:1 ratio. There is no need for that. So since your RAM is already fine get rid of the RAM overclock for maximum stability. Then with the multiplier at 9x just increase the FSB. With good cooling 450FSB is probably fine. That will give you 4Ghz ( 4.050 to be exact ) and that is about what the E8400 is capable of safely for long term use. You might get a little higher. 4.2Ghz was about the max.
 
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Solution
A

AMSA7

Honorable
Jun 26, 2013
21
0
10,510
Hi anort, thank you for your reply.

About playing the RAM at 1:1 what should I do? If I run the RAM at 1:1 that means that she will be underclocked. There is no problem with that, right? The only problem is that she will be sub utilized. Is that it?

There is any gain about running the RAM 1:2 (more Mhz) when compared with 1:1 (less Mhz).

If I want to run the RAM 1:1 what should I do? Running 1:1 I'll no be limited on rising the FSB? I mean, the way it is, I just can rise the FSB up to 400Mhz (420Mhz I'll test tonight). Running 1:1 I can rise the FSB up to 450Mhz without problem? Knowing that she runs (for now) stable up to 400Mhz? Do you understand what I mean?

"With DDR3 you would need to underclock your RAM for that 1:1 ratio. There is no need for that." What you mean with "THere is no need for that"?

What you mean with "Leave the RAM alone"?

Right now I have stock cooler (not from E8400, but from a D930 - It has the base on copper).

Kind regards.

EDIT: By the way, a curiosity: Before doing this overclocking stuff, when I rebooted the PC the computer was rebooting normally, without any strange behavior. After ocing, I notice that when rebooting the computer kind turn off and then turn on again. What's that?
 
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Deleted member 217926

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The 1:1 RAM/FSB ratio was more effective with the slower DDR2. DDR3 is faster and that is not needed. With DDR2 it was what performed best though. Just leave your RAM at it's default 1333 speed.

DDR is double data rate. So in effect DDR2 800 is running at 400Mhz and transmitting data on the rising and falling edges of the clock cycle thus doubling it's data rate to 800. So DDR2 800 is running at a 1:1 RAM/FSB ratio with an E8400 at 3.6Ghz. 9*400FSB = 3.6Ghz. What you have is DDR3 1333. Since it's also double data rate it is running at 667Mhz but is 1333 effective. Your E8400 can't run at 9 * 667 because that would be 6Ghz. The 1:1 ratio was best back when Core2 was new because DDR2 800 or 1066 was the fastest RAM you could get.

Stop all attempts at anything over about 3.6Ghz with a stock cooler. You need aftermarket cooling to be safe and not risk CPU damage.
 
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