Noob to Intel Memory Overclocking... Please Help...

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virtualrain

Limp Gawd
Joined
Jul 31, 2005
Messages
182
Hi,

I understand AMD overclocking well but I'm confused about Intel Overclocking and therefore RAM selection for a new Conroe build.

Help me out here by correcting or filling in the blanks...

On an E6600 Conroe we have:
Base bus speed = 266MHz
FSB = 266x4 =1067MHz
CPU = 266x9 = 2.4GHz
Memory (1:1) = 266x2 = 533MHz (Is this right?)

So for a bone stock system, you would run PC-4200 memory? Correct?

If you want to OC a little, you could do the following:
Base bus speed = 333MHz
FSB = 333x4 =1333MHz
CPU = 333x9 = 3GHz
Memory (1:1) = 333x2 = 667MHz (Is this right?)


So for the OC above, you would be best off with PC2-5400 memory? Correct?

Now let's go aggressive and say we go with...
Base bus speed = 370MHz
FSB = 370x4 =1480MHz (can you do this? or do you need to lower the FSB multi?)
CPU = 370x9 = 3.3GHz
Memory (1:1) = 370x2 = 740MHz (Is this right?)

So you would want good PC2-6400 RAM with this setup?

When would you ever use PC2-8000 RAM? Only if you use a higher ratio like 1:2? It seems like a lot of folks run their memory faster than FSB.. Is this normal?

What memory ratios are generally available on Intel Mobo's like P5W DH?

Sorry for the realy noob analysis here. Any help would be very welcome!
 
ive been learning ab it about memory too lately so heres what ive learned.
you can run ram out of sync with fsb and it can give you a perfomance gain (has been o\like this on intel cpus for a while and i think its like this now on amd's with am2 socket not sure)

with ram running in dual channel mode the lowest ratio you can do is 1:1 everything else has ram running faster than fsb and can add to your system performance.
so just find your cpu's max fsb and get ram to run at the highest speed it'll go.
 
virtualrain said:
can you do this? or do you need to lower the FSB multi?
Click to expand...
there is no "multiplier".. the fsb is quad pumped by design, it is not possible to change it :D

you do have the general idea though. >pc6400 ram is handy for two things really:
1. running >1:1 ratio does help performance a bit, lower access time to the memory and higher bandwidth, even if still limited by fsb bandwidth..
2. low multi chips, sey you need like 450mhz fsb to hit the max overclock of your chip? ;)
 
Ok thanks guys, can you tell me if this makes sense?...

So if I get an E6600 and it can run at 425 FSB (say at 425x8 = 3.4GHz) then a good RAM kit would either be a DDR2 800 kit that overclocks to DDR2 850 or even better... a kit that runs at DDR2 1066 since 425x2 = DDR2 850 with a 4:5 divider that's 850x1.25 = DDR2 1062?

Is that right?

So a set of sticks that will run tight timings at 1066 would be ideal in this scenario?

Am I missing anything?

BTW, I'm considering the ASUS P5W DH Deluxe with 975x chipset and I'm thinking about the OCZ Titanium Alpha VX2 2GB PC-8000 kit.
 
well at 425 fsb 1:1 would be ram at 850mhz and then dual channel makes it *2 so its at 1700 and it equals effective fsb (425*4) so pc2-6400 should be enough and timings would be a little relaxed over dimms specs i think.
pc2-8000 is still very expensive right now so thats up to you.
 
So anyone tried the OCZ PC2-8000 Titanium Alpha VX2? I am considering buy me one and i wanted to know how they work with Conroe.
 
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