Difference between DDR2-533 and DDR2-800

[cmdrdredd]

Originally posted by: jmke
no, they say there is no BIG performance difference... which there isn't...

Big enough to be worth it. you can buy a 667Mhz kit for $292 and a 800Mhz kit for about $305.

That's not much more to pay for a kit that is faster and definately will overclock.

this is assuming you're buying D9 based memory which I always recommend people do.

People playing the lowest price game will always get crap ICs and probably don't care about major performance anyway so to them this article speaks. To me and people who want maximum performance, no way.

 

[hans007]

the difference is effectively nothing.

it depends though.


ddr2-533 is typically CL 4. the equivalent latency ddr2-800 would be cl6. but most is CL5, so you'd have a miniscule latency advantage.

 

[cmdrdredd]

Originally posted by: hans007
the difference is effectively nothing.

it depends though.


ddr2-533 is typically CL 4. the equivalent latency ddr2-800 would be cl6. but most is CL5, so you'd have a miniscule latency advantage.

try This

That thread talks about memory speeds providing a difference. It does have an impact. Take a look. We have numbers too

 

[Yellowbeard]

Anyone else notice that the OP never came back?

 

[cmdrdredd]

yeah he probably got what he needed and didn't have need to reply.

 

[hans007]

Originally posted by: cmdrdredd

Originally posted by: hans007
the difference is effectively nothing.

it depends though.


ddr2-533 is typically CL 4. the equivalent latency ddr2-800 would be cl6. but most is CL5, so you'd have a miniscule latency advantage.

try This

That thread talks about memory speeds providing a difference. It does have an impact. Take a look. We have numbers too

that is not really a fair comparison..


the memory bandwidth doesnt matter. its still the latencys and ras timings that matter.


you guys used ddr2-800 at 4-4-3-4 vs ddr2-1000 at 5-5-5-4

the tras is equivalent on those, but a cycle at 1000mhz is 25% faster than one at 800mhz.

for the latencies to be equivalent at difference clock speeds you have to do

ddr-2-800 4-4-4-4 vs ddr2-1000 5-5-5-5. so that all latencies at ddr2-1000 would be exactly 25% higher to compensate for the 20% shorter cycles.

that said, you could be right. but the main idea is that if the bus is 1066mhz @ 64bits it can only take advantage of 533mhz of 128bit bus memorybandwith maximum. dual channel ddr2-533 is exactly the same bandwidth as 1066 p4 bus @ 64bit (each memory channel is 128bits x 533 effective clock).