Gigabyte GA-7DXR won't run in CAS 2.5/2 mode when using 3 sticks?

[Gandu]

My friend was telling me that mobo wont run in CAS 2.5/2 mode when you use 3 PC2100 256Mb sticks, says it works fine if 2 but not when using all 3 dimms. True?

 

[Democritus10]

Partly true. You may use up to 2 sticks of unbuffered RAM, but if you want to use all 3 slots, then you'll need to use Registered RAM.

 

[MrCoyote]

Is this documented anywhere? There was a review that someone filled all 3 slots with unbuffered, and had no problems.

 

[bevo]

Yep, it's documented in the MB manual, and by the way, it also applies to the upcoming abit KG7...

 

[chainbolt]

I'm not 100 sure, but it seems that the 7DXR is running with 3 sticks un-registered DDR memory, at least for the 100 or so minutes I had the 3 sockets populated. You can use only up 2 Giga un-registered, un-buffered memory. There is, by the way, nothing about this explained in the 7DXR manual. On page 3 they simply
"supports up to 3 Giga". But on their webside, Giga is explaining that you you can use a maximum og 2 Giga memory unbuffered, means unregistered, and up to 3 Giga buffered, means registered memory.

I was not aware of this point, so I just made a quick check as to see whether all 3 sockets were working, when I wrote my review. I put in

2 x 128 Samsung PC 2100, unregistered, unbuffered
1 x 256 Nanya CL 2.0, unregistered, unbuffered

Unfortunately I sold the 2 x 128 sticks after the review, so I cannot check it anymore. But other users in the amdmb.com Gigabyte forum reporting the same.

 

[chainbolt]

<< Yep, it's documented in the MB manual, and by the way, it also applies to the upcoming abit KG7... >>



Hi Bevo:

Could please tell us the page in the 7DXR manual, where this is documented? In my manual, I cannot find anything like this. It's revision 0.2 printed on March 30, 2001. My manual simply sasy on page 3: &quot;supports up to 3 GB DRAM (max)&quot;

Thank you

 

[bevo]

chainbolt...This came from an owner of the 7dxr board on amdzone.com