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Overclocking E8400

O

ohm

n00b
Joined
Dec 6, 2011
Messages
23
I'm trying to overclock 3.0 Ghz E8400 on Abit IP35 Pro without overclocking memory.
My memory can run at either: 5-5-5-15-2T at 1.9v or 4-4-4-12 at 2v.
I'm using 5-5-5-15-2T.
Without overclocking CPU, dram speed is set to DDR2-816 with 1:1.20 ratio.
When I change front side bus speed to 378 I end up with 3.4Ghz CPU speed.
Dram speed changes to following ratios
1:1.10 - DDR2-756
1:1.20 - DDR2-907
1:1.25 - DDR2-945
1:1.50 - DDR2-1134
1:1.66 - DDR2-1260
1:1.200 - DDR2-1512

If I don't want to overclock memory, is my only option to leave it at 1:1.10 - DDR2-756 setting or should I try running memory at DDR2-907?
How much performance will I be loosing by running memory at 60mhz lower?

Also is there any need to change voltage settings?
I just changed them from auto to default and did not change anything else.
 
Is there a specific reasoning you don't want to overclock the memory at all? Or is it the memory can't handle overclocking that much?

You probably wouldn't notice too much of a real world impact at either setting but if the RAM can handle running at 907MHz within voltage spec and decent timings then why not use it? If it can't drop down to 756 and the 400MHz gain from the CPU should make up for the difference.
 
did you set your settings to Manual?

i have my e8400 running at 3.6 ... multi at 9 and switched fsb from 333 to 400 and thats it...
have been running at this same speed since december 2008.. asus rampage formula x48 though...
 
Looks like the problem with my motherboard Abit IP35 Pro is that it's not possible to unlink CPU and memory.
I overclocked to 378 Mhz FSB which overclocked DDR2-800 memory to DDR2-907. It seems to be working fine.
Hopefully Kingston Value ram can hold out with these speeds.
 
Dear ohm
That's meaningless you said "unlink CPU and Memory"
In Core2 architectural .. CPU & Memory always linked .. you should keep the ratio between both 1:1.
Therefore you should adjust your ram frequency to 667MHz before overclocking .. any increase in memory MHz before overclocking is completely useless.
 
MrEhabYoussrey said:
Dear ohm
That's meaningless you said "unlink CPU and Memory"
In Core2 architectural .. CPU & Memory always linked .. you should keep the ratio between both 1:1.
Therefore you should adjust your ram frequency to 667MHz before overclocking .. any increase in memory MHz before overclocking is completely useless.
Click to expand...

Thanks. I haven't though about downclocking memory before raising FSB.
To my knowledge motherboards with Nvidia chipsets let you unlink CPU from memory in Core2 architecture.
I've seen this done in guides and youtube videos.
My motherboard unfortunately does not do that.
 
Looks like downclocking memory first and then raising FSB speed makes no difference in my case.
The end result is still the same.
 
ohm said:
My motherboard unfortunately does not do that.
Click to expand...

There is no "Unfortunately" Here .. nVidia Motherboard didn't unlink cpu and memory .. it 's just let you adjust the value and it handle the ratio between both..
the concept is the same.
and there are a benefits from the downgrading the ram that as "TheGardenTool" say .. it's the decent timming.
 
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