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Thinking about an E8400

post #1 of 17
Thread Starter 
I'm thinking about purchasing an E8400, but I have a question with how OCing and RAM comes into play.

Say that I want to run the E8400 at 4.0Ghz, and I use 4GB of DDR2 800 RAM, if overclocking the CPU to 4.0Ghz, what would that make the RAM run at?

I'm really not sure as to how the RAM speed multiplies or anything like that, but if running the CPU at 4.0Ghz makes my RAM higher than 800, I want to make sure that the RAM will run correctly.

I'm thinking about getting a 2x2GB kit of OCZ Reaper DDR2 800 RAM.

Right now I have an E2140 at 3.2Ghz, and my RAM runs at 800 from 667, but it's not very stable. In fact, the RAM is actually BSODing quite often now, so I need new RAM.

If anyone can help me out with how the RAM is multiplied or however it works when changing your FSB, I'd appreciate it.
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post #2 of 17
Well my E8400 runs 24/7 at 4.1GHZ and I haven't even touched the RAM yet (OCZ SLI Ready 800)
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post #3 of 17
Generally a 1:1 ratio for fsb to ram for overclocking. So if your FSB is 500 you want your ram at 1000 because it is 2 channel or something like that.
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post #4 of 17
Thread Starter 
Quote:
Originally Posted by jetOne View Post
Well my E8400 runs 24/7 at 4.1GHZ and I haven't even touched the RAM yet (OCZ SLI Ready 800)
Well, with my board, when I change my FSB, the RAM automatically always changes.

For instance right now, I have it at 400x8, which makes it 3.2Ghz, and the RAM which says 2.00 for the multi I'm assuming and that in the BIOS makes it at 800. I cannot make it run at default speeds, so I'm assuming with my board, when changing the FSB to make the E8400 at 4Ghz will make the RAM run higher, unless I'm mistaken.

Quote:
Originally Posted by NewAtOCing View Post
Generally a 1:1 ratio for fsb to ram for overclocking. So if your FSB is 500 you want your ram at 1000 because it is 2 channel or something like that.
Okay, so for the E8400, that's 500x8 which makes it 4Ghz, so the RAM would be running at 1000 is what you're saying?

Does anyone know if the OCZ Reapers DDR2 800 2x2GB kit will run at 1000mhz?

If not then I'll have to pick up higher clocked RAM..
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post #5 of 17
Quote:
Originally Posted by halifax1 View Post
Well, with my board, when I change my FSB, the RAM automatically always changes.

For instance right now, I have it at 400x8, which makes it 3.2Ghz, and the RAM which says 2.00 for the multi I'm assuming and that in the BIOS makes it at 800. I cannot make it run at default speeds, so I'm assuming with my board, when changing the FSB to make the E8400 at 4Ghz will make the RAM run higher, unless I'm mistaken.

Yeah, but when you get a e8400 wich has 10x multi (i think) you get 400x10 and ram divider 2.00.

4.ghz.
    
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post #6 of 17
Quote:
Originally Posted by halifax1 View Post
Well, with my board, when I change my FSB, the RAM automatically always changes.

For instance right now, I have it at 400x8, which makes it 3.2Ghz, and the RAM which says 2.00 for the multi I'm assuming and that in the BIOS makes it at 800. I cannot make it run at default speeds, so I'm assuming with my board, when changing the FSB to make the E8400 at 4Ghz will make the RAM run higher, unless I'm mistaken.



Okay, so for the E8400, that's 500x8 which makes it 4Ghz, so the RAM would be running at 1000 is what you're saying?

Does anyone know if the OCZ Reapers DDR2 800 2x2GB kit will run at 1000mhz?

If not then I'll have to pick up higher clocked RAM..
Because you probably have your ram speed set on auto you can manually go in and downclock your ram.

Edit: The multi on the E8400 is 9x so if you were to run at 445fsb x 9 = 4000mhz = ddr2(890) or 445mhz 1:1.
Edited by hout17 - 12/19/08 at 8:41pm
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by j0z3 View Post
Yeah, but when you get a e8400 wich has 10x multi (i think) you get 400x10 and ram divider 2.00.

4.ghz.
I thought the E8400 only had a max multi of 8?

If it's 10 then I should have no problem at all.

Quote:
Originally Posted by hout17 View Post
Because you probably have your ram speed set on auto you can manually go in and downclock your ram.
In my BIOS, I cannot manually change the speed, only by certain multipliers, for instance 2.00, 2.40, 2.50, 3.00, and so on.

Right now it's running at 2.00 but even then the 667Mhz RAM runs at 800. I can't unlink the RAM or anything like that.
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post #8 of 17
The 8400 has a multi of 9. You need to manually adjust your ram speeds. Not sure about the 1:1 ratio though, thats just what i've heard, I have 1066 so I don't have that problem.
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post #9 of 17
Quote:
Originally Posted by halifax1 View Post
I thought the E8400 only had a max multi of 8?

If it's 10 then I should have no problem at all.



In my BIOS, I cannot manually change the speed, only by certain multipliers, for instance 2.00, 2.40, 2.50, 3.00, and so on.

Right now it's running at 2.00 but even then the 667Mhz RAM runs at 800. I can't unlink the RAM or anything like that.
im sorry, its a 9x multi... 450x*9 can do 4.0ghz and your ram would be 900Mhz.
    
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post #10 of 17
maybe a 3:4 ratio?

5) Dividers - The ratio of CPU:RAM is known as a divider. On older Intel systems, best performance is achieved through highest possible stable operation in synchronous (1:1) CPU:RAM operation. On such systems, the higher the FSB, the better performance. Newer Intel systems can benefit from a divider that favors the RAM (e.g. 3:4 which means the RAM runs as 4/3 the external clock speed - the CPU always operates at the external clock speed). It is generally best to start with a 1:1 divider and then test other dividers for potentially greater performance.

I found that here....
http://www.overclock.net/intel-cpus/...ing-guide.html
Edited by NewAtOCing - 12/19/08 at 8:46pm
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