troubleshooting Question

New 800mhz RAM slow as old 667Mhz - why?

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kcs_tec asked on
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Hi people,

Quick question about DDR2 memory and why the speeds differ so little on my system:

I have an Asus P5NE-Sli motherboard with Nforce 650 chipset (supports upto 1066FSB to RAM)
and I was using 2 sticks of 5300 Crucial (5-5-5) ram in bank A only (bank B is faulty and I can't
put any ram in it as the system halts). I know this probably means that my system can't do
dual-mem access anymore, but am I right in thinking this makes little difference in most applications).

My real question is why, in Sisoft Sandra benchmarks, I only get a mem-throughput of 4.18GB/sec
when the reference benchmarks for other systems show throughput of 5.1GB/sec.  Even the ref
benchmark for CL3200 ram achieved a 12% higher benchmark than my 5300 ram!

Yesterday I tried my system with with sticks of 1GB Samsung 6400 ram (6-6-6 timings) and the
benchmark was virtually identical - throughput 4.19GB/sec and the latency tests came out even worse
with the 6400 ram than with 5300!
(In my BIOS the settings are all set to AUTO). My processor is an intel P4 3.2ghz EMT64 and I'm using
Windows XP 32bit SP2).

Why are my benchmark results so low and why is there so little difference (just 1%) between mem
throughput of 800mhz ram and 667mhz ram?

Thanks for any comments on this..

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