Memory Compatibility and speeds

Giveinuptheghost · 09-24-2008, 07:50 PM

From what I understand PC2 6400(800mhz) is backwards compatible with PC2 5300(667mhz) I just got 2, 2gb 6400 sticks and I was wondering if I installed them with the other two 1gb 5300 sticks would the new 6400 function at the 5300 speed or would they be independent and function at their normal operating speed (800mhz) . I’m using a MSI P6N SLi Platinum nForce 650i Socket 775 duel core 2.0GHZ.

**Cromewell** · 09-24-2008, 09:38 PM

They will run at the slowest speed of all the sticks you have installed. So in your case it will all run at PC5300 speeds.

Pck21 · 09-24-2008, 09:44 PM

Quote:

Originally Posted by Cromewell

They will run at the slowest speed of all the sticks you have installed. So in your case it will all run at PC5300 speeds.

Bingo.

Next time, try and get the fastest ram your mobo will take. Otherwise, you're just handcuffing your system's performance.

Giveinuptheghost · 09-24-2008, 10:39 PM

I just got Sli board, and the 5300 is the ram outta my old Acer that i wanted to reuse but since its going to slow down the new 6400 sticks i'ma just pawn it off (the 5300) on a frend in need thanks alot guys!

hackapelite · 09-24-2008, 11:41 PM

Quote:

I just got Sli board, and the 5300 is the ram outta my old Acer that i wanted to reuse but since its going to slow down the new 6400 sticks i'ma just pawn it off (the 5300) on a frend in need thanks alot guys!

If you have the sticks in dual-channel, the performance loss is going to be minimal (not noticeable in any real-life applications, not even Crysis) and you'll only notice an *insignificant* ()if even that improvement by removing the 5300 sticks it they have really bad timings. Generally amount>speed as far as RAM in concerned.

Giveinuptheghost · 09-25-2008, 05:08 AM

Okay, i'll keep that in mind I think i'll use them (5300) until I finish out my build with the last 4Gb of 6400 RAM thanks again.

09-24-2008, 07:50 PM	#1 (permalink)
Giveinuptheghost New Member Join Date: Sep 2008 Posts: 10	Memory Compatibility and speeds From what I understand PC2 6400(800mhz) is backwards compatible with PC2 5300(667mhz) I just got 2, 2gb 6400 sticks and I was wondering if I installed them with the other two 1gb 5300 sticks would the new 6400 function at the 5300 speed or would they be independent and function at their normal operating speed (800mhz) . I’m using a MSI P6N SLi Platinum nForce 650i Socket 775 duel core 2.0GHZ.

09-24-2008, 09:38 PM	#2 (permalink)
Cromewell Moderator Join Date: Dec 2004 Location: Canada Age: 26 Posts: 11,802	They will run at the slowest speed of all the sticks you have installed. So in your case it will all run at PC5300 speeds. __________________ You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in command here. www.userfriendly.org

09-24-2008, 10:39 PM	#4 (permalink)
Giveinuptheghost New Member Join Date: Sep 2008 Posts: 10	Thanks I just got Sli board, and the 5300 is the ram outta my old Acer that i wanted to reuse but since its going to slow down the new 6400 sticks i'ma just pawn it off (the 5300) on a frend in need thanks alot guys!

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09-25-2008, 05:08 AM	#6 (permalink)
Giveinuptheghost New Member Join Date: Sep 2008 Posts: 10	Okay, i'll keep that in mind I think i'll use them (5300) until I finish out my build with the last 4Gb of 6400 RAM thanks again.