Difference bet DD2-667 and DDR2-800 and up

[Calapenian]

---

unsa man nakalahi nila mga bossing? what 667 and 800 stand for? i need ur ideas..

[cloud]

DDR2 667 runs @ 333mhz x2 while 800 runs @ 400mhz x2. speed is the difference. more headroom for your OC. hehehe.

[Calapenian]

600 and 800 --- speed?

[poldopunk]

unsa man nakalahi nila mga bossing? what 667 and 800 stand for? i need ur ideas..

In the computer world, speed is frequency, cycles is measured in frequency and the unit for frequency is Hertz. Current technology in memory says its double data rate which means it sends data twice in 1 cycle hence the name double data rate.

What does this mean with regards to your memory?

It means that 667 or 800 is not the actual memory frequency. The actual memory frequency is the rated speed divided by 2 (rated speed / 2).

For example:

If you have a DDR2-667 memory, 667 divided 2 is 333.5. So your memory is operating at 333.5 but again, since the memory sends out data twice in 1 cycle, you have 667.

Why are some memory called PC2-4200, PC2-6400, PC2-8500?

PC2 indicates that the memory is the second generation of SDRAM(DDR2). The number beside that is the amount of data that the memory can move and is measured in Megabytes (MB). Now, since there are 8-bits in a byte, simply divide the number you see there by 8 and you get the frequency of the memory.

for example:

PC2-6400: 6400 / 8 = 800.
PC2-6400 = DDR2-800MHz (where the actual frequency is 400 MHz)

What does this mean with 'more headroom for your overclock'?

Most motherboards in the market have the memory and the front side bus frequencies tied. This term is called synchronous. When you increase the front side bus, you also increase the memory frequency. Unlike the CPU which can easily handle an overclock of 300 MHz or more, this is different for the memory which can only take a few MHz before it becomes unstable or it doesn't POST at all.

If you plan on increasing the front side bus, you need to have a high frequency memory. This gives you a large headroom before you hit the limits of your front-side bus and therefore, leaving your memory in its default speed.

[Calapenian]

explained well.. thanx boss poldo... 2 thumbs up!

[i-7]

Karon pako kasabot unsa meaning aning PC2-6400.

[poldopunk]

^ i'm glad to be of help.

[reypuzon]

nice post poldo, now i know... the pc den # that stands for.

[Calapenian]

the higher the frequency, the better?

[clyde_lim]

what a nice data poldo...tnx anyway...