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Adding 667MHz RAM to 533MHz RAM

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Name: max789
Date: March 29, 2008 at 20:16:18 Pacific
OS: Win XP Home
CPU/Ram: E6400 1GB
Product: Asus
Comment:

Hi all

I've a 1066MHz FSB Intel Core 2 Duo E6400 system with 1GB (512MB x 2) 533MHz DDR2 RAM. I'd like to add 1GB RAM and was going to get another pair of 512MB 533MHz DDR2 RAM. However, a friend has just offered me a pair of 512MB 667MHz DDR2 RAM cheaply.

I originally planned to stay with 533MHz RAM so as to keep a synchronous 1:1 FSB/RAM relationship for best performance.

Now, I wonder if mixing a pair of 512MB 533MHz DDR2 RAM with a pair of 512MB 667MHz DDR2 RAM will have a negative performance impact. I understand that such a combination runs at the lower 533MHz memory speed which is fine but since the 667MHz RAM will need to use a 5/4 divider and also has different timings, I'm a little concerned that performance will suffer compared to having identical 4x512MB 533MHz DDR2 RAM.

No overclocking is planned.

Your comments, please! Thanks.



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Response Number 1
Name: jam
Date: March 29, 2008 at 20:20:59 Pacific
Reply:

All RAM will run at the speed of the lowest rated stick(s). In other words, since DDR2-533 can't run as DDR2-667, the system will automatically force the DDR2-667 to run as DDR2-533.


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Response Number 2
Name: max789
Date: March 29, 2008 at 20:32:15 Pacific
Reply:

Thanks for your prompt reply, jam.

A quick question about timings. Under CPU-Z SPD, the 533MHz RAM has two timings sets - 266 MHz and 200 MHz. Does it mean that, if I use CPU-Z on the 667MHz RAM and it has a 266MHz timings set (in addition to 333MHz timings) which is identical to that for the 533MHz RAM, things should be alright?


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Response Number 3
Name: jam
Date: March 30, 2008 at 06:58:52 Pacific
Reply:

Unless you configure them manually, timings will be auto-selected based on the SPD info.


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