566 vs 667

How significant better as far as performance and speed is 533mhz memory compared to 667mhz?

 

There wont be too much of a difference as 667Mhz memory have higher latencies than 533MHz memory. The higher latency is going to equalize any boost in performance due to the increase in clock speed.

Check the below review form some general difference in their performance...
http://www.xbitlabs.com/articles/memory/display/ddr2-ddr_11.html

 

thx that helped

 

I have to disagree with Miner as my source says otherwise.

http://www.legendmemory.com/modules.php?op=modload&name=News&file=article&sid=2309

Can anyone else provide more light on this?

 

These are not real speeds anyway!!!

533Mhz is actualy 333Mhz!!! Its got something to de with pentium M core architecture also there is no point in using DDR2.

Intel wants your money thats all.

 

PS..pentiums use higher latency times unlike athlons.

 

... same goes for amd use ddr 400 which is actualy 200mhz.

http://www.legendmemory.com/modules....ticle&sid=2309--
Overall, we can say that DDR400 appeared slightly more powerful than DDR2-533 its because DDR400 is 200Mhz and DDR2 533 is 333Mhz!!!!!!

 

Not sure exactly what you are getting at there.

Regarding the differences in the benchmarks, one set is simply testing using applications geared towards testing specific aspects of memory performance. The other set of benchmarks uses real applications that you may use from day to day (gaming), to test the effects of the different memory configurations. I for one tend to give more weight to the real world application benchmarks. I mean who cares if a memory benchmark suite shows the higher clocked memory to be better? If the applications I run benefit more from the lower clocked memory with lower latency, I'm going to use the lower latency memory.

The only problem I see is there are so many different things that can effect performance, that I don't think either of those test results mean anything to us since we are talking about a different platform altogether (SODIMMS), in a notebook.

If you want to look at graphs as a measure of performance, look for graphs that test the performance in a notebook platform. I have not seen any yet, but I would be inclined to think the difference between lower latency 533, and higher latency 667 will be pretty small. Someone do some testing!

 

I've answered all your questions!!!

lower latency means better and faster speeds but pentium architecture prefer to work with higher latencies so this wont make any difference.

533 and 667 - same thing as 333mhz and 400mhz for AMD cpus

you wont notice any performance increase!!!

so no point spending money on something that doesnt effect your work...

better spend on something like hdd etc (its your decision)

 

You crack me up!

Maybe there is some kind of language barrier, but I only understood about 25% of what you have said.

 

sorry but im not english

 

NOW LOOK AT FSB - FRONT SIDE BUS can you see 677MHZ anywhere?
OR THIS ONE?

 

Basic stuff here. A multiplier is used to achieve the actual memory speed. The multiplier DOES effect memory performance. Are you claiming that it doesn't?

 

hence DDR double data rate.

 

multiplier has got nothing to do with FSB as it does with CPU speed!!!

To achieve higher CPU frequency you multiply MULTIPLIER BY FSB = CPU FREQUENCY. TO OVERCLOCK YOU EITHER CRANK FSB HIGHER OR FSB!!!

Higher FSB - Higher Memory speed and CPU speed.

What i ment was is that FSB gets as high as 200Mhz!!!

but you were comparing 533Mhz and 667Mhz memory modules and i said that its not the actual speed of these memory. As you can see on screenshot - maximum speed is 200Mhz - not 533 or 667.

Memory runs at the same speed as FSB not higher! so there wont be any noticeble difference between those two!!!!!!!!!

Screenshots prove that.

 

ALSO there is no point in higher RAM frequencies if your CPU runs only at 200MHZ FSB.!!!

Prove me wrong - click here

 

Look: http://www.hexus.net/content/item.php?item=1337&redirect=yes

 

ddr is double pumped, it operates at 2x the bus frequency
ddr2 is quad pumped, it operates at 4x the bus frequency

ddr @ a bus speed of 200mhz is running @ 400mhz effectively
ddr2 @ a bush speed of 200mhz is running @ 800 mhz effectivly

the 200mhz bus speed is not limiting the ram as the ram can do 2 (ddr), or 4 (ddr2) operations per clock cycle

ddr2 800 at cas 4 has the same latency as ddr 400 at cas 2 but the ddr2 has double the bandwidth

 

**** Right Chris ^_^

 

I'm not here to give you a class on data bus architecture theory. If you don't understand that the bus frequency is NOT the sole factor that determines data throughput, then you need to start with some more remedial classes.

 

You were ment to prove me wrong didnt you? or to explain the situation from your point of view.

ps. if you cant find the answer - google IT!!! (some great hacker said that).

 

Deleted...

 

Alright, keep it civil in here and stay on topic or the thread will be closed.

Thanks.

 

Look at this link first: http://www.hexus.net/content/item.php?item=1337&redirect=yes

IT has table with DDR and DDR2 speeds, look carfuly!

CPU,RAM and motherboard alway operate on the same FSB (FREQUENCY). RAM CANT RUN AT HIGHER SPEED!!! THAN FSB (IT ADJUSTS ON TO THE SAME FREQUENCY AS MOTHERBOARD!!!).

400,533 and 667 are simply speed at which data travels through FSB (IN Mbit/s).

DDR : 100MHz driven clock -> 100MHz data buffers -> DDR applied -> 200MHz final data frequency
-----------------------------
DDR-II: 100MHz driven clock -> 200MHz data buffers -> DDR applied -> 400MHz final data frequency

 

Just curious...is there no rule (formal or informal) against triple or quadruple posting?

 

Actually...I will combine those posts. I don't think there is a written rule. You really should just edit the previous post. This is kind of frowned upon because it can artificially increase post count.

Post combined!

 

so through 3 pages of arguing and foreign languages is it worth it to spend the money on 667 ram on a core duo notebook or is 533 just as good or no noticble difference in 1gb 533 ram or 1gb 667 ram

 

hmn, now Im confused. Anybody know for sure?

 

I'm not sure but I went ahead and did it anyways on my Toshiba Satellite M100. It will be here tomorrow. We shall see...

 

To be honest, there is not much differenc between the 2. The difference in benchmarks between what I posted and what the other poster did is mostly relatred to the difference between synthtic and real world benchmarks. I would trust the performance in real world apps rather than sythetics.

In any case if you are going to pair any new 667 memory with the existing 533 memory then the faster memory is going to automatically downclock and run at the same speed as the 533 module. You could also wait a bit and see if the latencies for newer 667 go down. In such a case, an upgrade might be more beneficial.

 

Hi
Can anyone plz tell me whether I can use DDR 667MHZ memory for my laptop that has ATI XPRESS 200m chipset.

thanks

 

1. There no such memory as DDR 667. 667MHz memory is only available in DDR2 format. DDR and DDR2 are not compatible with each other and so is not interchangable.

2. Is your laptop based on an Intel cpu or AMD based?

If it is AMD based ATi 200m then you can only use memory upto DDR 400. DDR2 is not compatible.

If it a Intel based ATi 200m, then there are certain models which support memory upto DDR 400 and there are versions which support memory upto DDR2 667. So, compatibilty of DDR2 667 depends on the specifications of your system.