DDR2 system. What should the FSB bus speed be?

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edm

Senior member
Mar 7, 2000
527
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I have an older system running DDR2 1066 (PC2 8500) with a Phenom II x4 940

I was running 4gb (2x2) at 1066 but recently installed two more sticks, for a total of 8gb (4x2). Since my motherboard (here) states it wont run 4 sticks at 1066
*Due to AMD CPU limitation, DDR2 1066 is supported by AM3/AM2+ CPU for one DIMM per channel only
Click to expand...

So I went down to 800mhz. (although I did test 1066 with all 4 sticks installed and it booted up fine?)

Anyway, my question is, what should the FSB frequency be set to, in bios? It's currently set to 200 (it looks like it defaults to 200). The available range is 200-600. Is this good where it's at?

Thanks in advance.
 
Last edited:
Eug

Eug

Lifer
Mar 11, 2000
24,026
1,644
126
My Acer slim AM3 desktop memory speed is 667/1333 MHz DDR3, but when I put 4 sticks of RAM in (2 banks of 2 DIMMs), with my Athlon II X3 435 it drops down to 533/1066 MHz. I can't push it to 667/1333 as there is no way to set it to do that IIRC. If I remove two sticks, it defaults to 667/1333.

The strange part though is when I removed the Athlon II and put in a Phenom II 1055T, all of a sudden it defaults to 667/1333 and runs just fine with the same 4-DIMM memory configuration as before.

I came across this article:

https://techreport.com/review/16382/amd-socket-am3-phenom-ii-processors

One caveat: the Phenom II only supports 1333MHz DDR3—at least, officially—with a single DIMM in each memory channel. With four DDR3 DIMMs, 1066MHz is the standard. Such limitations are nothing new, of course. Previous Phenoms have long supported 1066MHz DDR2 memory, but only with a single DIMM per channel.

However, in my case I get the full 1333 MHz DDR3 on AM3 even with 2 DIMMs per channel with Phenom II (but not Athlon II). Weird.
 
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