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PC2100 & PC2700 DDRram

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8 replies

by acrd0197cas

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Hello,
I have a question about DDRram. I was wondering if I can use a stick of 512mb PC2700 DDRram and a stick of 256mb PC2100 DDRram on the same computer. I am not sure what the PC numbers mean and if the are interchangable.

Thanks
Chris

8 replies

by thechas

1. If you are running W95, W98, or Me, don't bother.
All 3 have a bug that can cause the system to lock up with more than 512MB of RAM.
This bug is VERY configuration dependant, and can show up at any time after you have the greater memory.

2. What is the front side bus speed of your CPU?
PC 2100 works for up to 266MHz FSB.
If your CPU has a faster FSB, you will have the best overall performance with just the 512MB PC2700.

The numbers are extensions of the PC100 and PC133 used on SDRAM.
PC100 = 100MHz
PC133 = 133MHz
PC2100 = 2100MHz
PC2700 = 2700MHz

Chas

by thechas

Verified some further information:

PC2100 for up to 266MHz front side bus CPU
PC2700 for up to 333MHz front side bus CPU

Chas

by acrd0197cas

The CPU is an AMD XP1800 with a 266mhz front side bus. The motherboard, in case it matters is a Gigabyte GA-7VRX. I ran into some problems with my computer freezing up after I installed both chips. I am running windows 2000 professional. I was wondering if the lock up had anything to do with mixing the speeds of ram. Do you think this is possible? Do you suggest just letting in the 512mb of PC2700?

by bohicam1

The motherboard you are referring to is only capable of using the pc2100 DDRam. You will need to upgrade the motherboard to one that can handle the PC2700 DDRam.
www.gigabyte.com

by bohicam1

OOPS!!!
Scratch that. I didn't dig deep enough. The mobo does support both types of Ram. Perhaps it is just an issue of mixing the two speeds.
Sorry for the mixup,

Mike

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