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Simple RAM dual-channel question. P5B Deluxe

Forum Motherboards & Memory : Memory - Simple RAM dual-channel question. P5B Deluxe

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enewmen   02-06-2007 at 07:05:50 PM

Hi,
I have a P5B Deluxe.
I bought 2 gigs (2 sticks) CHEAP DDR2 800 RAM, only gets up to 360 Mhz.
Later I want to another 2 sticks of GOOD DDR2 800 RAM that can easily handle 400+Mhz at CL4.

So, there is 2 slots for Chanel A and 2 slots for Chanel B.
How can I arrange this so the same speed RAM is paired and the faster RAM gets used first.
Thanks!

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caamsa   02-06-2007 at 07:36:01 PM
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I could be wrong but I don't think you can. All the memory will run at the same speed. Anyone else................ :?: I think if the speed of one set is faster or has different timings than the other set it would not work right.

Reply to caamsa
evongugg   02-06-2007 at 07:56:59 PM
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You can mix RAM on different channels.
I would put the faster RAM in channel zero.
Not sure if you will get any benefit. All the memory might run at the lowest speed of the two.

Reply to evongugg
cookin   02-06-2007 at 08:11:04 PM
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All of the RAM will default to the speed of slowest RAM.

Reply to cookin
enewmen   02-06-2007 at 08:43:54 PM
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Thanks for the posts people!
It seems all RAM defaults to the slowest stick.
I'll need to replace my slow DD2 800 RAM and get 4 gigs of high-speed RAM when ready to upgrade.
So, the moral is: If you care about overclocking, get good RAM !! I thought even cheap DD2 800 RAM can reach 400 Mhz with mild timings and high voltage. I was wrong. Don't skimp on RAM. :D

Reply to enewmen
Mondoman   02-06-2007 at 11:27:02 PM
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Quote :

... I thought even cheap DD2 800 RAM can reach 400 Mhz with mild timings and high voltage. I was wrong. ...


Not sure what you mean here. DDR2-800 runs on a 400MHz clock, so the RAM is rated to run at 400MHz. If it doesn't, it's defective and should be exchanged free under warranty, right?

Reply to Mondoman
enewmen   02-07-2007 at 01:29:29 AM
- 0 +

Quote :

... I thought even cheap DD2 800 RAM can reach 400 Mhz with mild timings and high voltage. I was wrong. ...


Not sure what you mean here. DDR2-800 runs on a 400MHz clock, so the RAM is rated to run at 400MHz. If it doesn't, it's defective and should be exchanged free under warranty, right?

yes. one should think so..

Reply to enewmen
enewmen   02-07-2007 at 01:32:28 AM
- 0 +

Quote :

You can mix RAM on different channels.
I would put the faster RAM in channel zero.
Not sure if you will get any benefit. All the memory might run at the lowest speed of the two.



Hi.
You think the if I had 2x 1 gig and 1x 512. I should put the 512m stick on one channel and the 2x 1 gig sticks on the second channel. It seems impossible to get a dual-channel benifit with these sticks. (unless I remove the 512m stick)

Reply to enewmen
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