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Memory speeds

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Memory speeds

i had 256 mb samsung ddr ram 2100
and then i bought 512 mb samsung ddr ram 3200
i took the 256 and replaced with 512 as 512 on its own seemed faster as i did a few timings on loading applications
but when i did a speed check i got 1500MB/sec for my 512 ddr 400 3200
i'd like to know what other people got , because my speed is no way near 3200
9 REPLIES
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Memory speeds

If your motherboard previously had ddr2100 in its likely that it will only accept RAM with speeds up to 2100 (ddr266) or 2700 (ddr333).

If that’s the case your new stick of RAM will be running at 2100 speeds not 3200 (ddr400) speeds it can run at.
holdtight
Grafter
Posts: 1,634
Registered: 15-06-2007

Memory speeds

If you can supply us with the make and model of motherboard we can tell you

or you can go to the manufacturers website and look at the specs for your board and it will tell you the highest memory in mhz it will take
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Memory speeds

yh its an asus a7v8x-x
it supports ddr 400 to 2 banks
Community Veteran
Posts: 38,305
Thanks: 971
Fixes: 57
Registered: 15-06-2007

Memory speeds

This is a socket A motherboard. Which AMD processor have you got. See this for why I asked the question
Quote
Socket A processors came with frontside bus speeds including 200 MHz (100 MHz x 2), 266 MHz (133 MHz x 2), 333 MHz (166 MHz x 2), and 400 MHz (200 MHz x 2)
Also have a look at this link XP and note that the Duron processor only supported PC2100 memory
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Memory speeds

266MHz
Community Veteran
Posts: 38,305
Thanks: 971
Fixes: 57
Registered: 15-06-2007

Memory speeds

Thats the problem then. The motherboard will default to the processor front side bus speed being the same as the memory speed (2 x 133)
If you have a look at the manual you may be able to force the memory speed to 2 x 200 but there is a significant risk that your system becomes unstable. I will try to download the manual and have a look at the options
N/A

Memory speeds

ok cheers mate i have already set it to ddr 400 in the bios
in the manual it says ddr400 is supported with 266 fsb
Community Veteran
Posts: 38,305
Thanks: 971
Fixes: 57
Registered: 15-06-2007

Memory speeds

I think I see where the confusion has arisen. Increasing the memory speed from 166 to 200 doesn't increase the memory bandwidth as far as I remember see this quote
Quote
The FSB is the connection between the processor and the chipsets' Northbridge.
On a K7-platform, the memory controller is integrated into the Northbridge, so the FSB also determines your systems' memory bandwidth and I/O bandwidth since the Northbridge connects to the Southbridge and thus the rest of the system.

What this means is increasing your memory speed can improve the system performance a little as it makes the memory respond quicker but it doesn't seriously affect the memory bandwidth as that is still limited by the FSB which in your case is limited by the processor which can only accept 2 x133
N/A

Memory speeds

ok thanx for that , thats some good info.
so i might as well throw my samsung 256 mb ddr 266 2100 back in then!
yh ill do that and run a few tests again
cheers
bye