CL2.5 vs CL2

[tnguyen88]

As far as PC2700 DDR is concerned, is there a noticeable or signifigant gain from buying CL2 memory over CL2.5? Also, what would be the chances that I'd be able to run some Crucial CL2.5 at 2 with no problems?

 

[SHAGVIRUS]

http://www.ocsystem.com/ddrmemspeedm.html


i had pc2100 run at cas2 - 4way 3-6-3 2t but needed 2.8 volts to do it and it wasnt 100% stable
at 150 fsb...133 might be ok...

 

[Xazzu]

really, you won't notice any difference between 2 and 2.5, we're talking hella fast clock cycles here, there's a very minoooote difference between them in human speed terms. I doubt you're running anything hardcore enough to see the advantage 🙂

 

[tnguyen88]

Thanks for the responses guys, I kinda figured that there wouldn't be any major difference... just wanted to make sure.

 

[Kingofcomputer]

From Crucial's FAQ:

What is the performance difference between CL2 and CL2.5 DDR modules?

Description:

What is the performance difference between CL2 and CL2.5 DDR modules?

Solution:

CAS latency 2 parts process data a little quicker than CAS latency 2.5 parts in that you have to wait a half clock cycle less for the initial data. However, after the first piece of data is processed, the rest of the data is processed at equal speeds. Latency only affects the initial burst of data. Once data starts flowing, there is no effect.

Bear in mind, a clock cycle for a system properly using a PC2100 DDR module is 8 nanoseconds, so the difference between CAS latency 2 and CAS latency 2.5 for PC2100 parts is 4 billionths of a second. You probably won't be able to notice the difference.

All of Crucial's PC1600 DDR parts are CAS latency 2.

 

[HoMeZ]

How do you tell if your ram runs at CL 2 or CL 2.5?

 

[Dm301]

Originally posted by: HoMeZ
How do you tell if your ram runs at CL 2 or CL 2.5?

Check your BIOS, it usually tells you there.

 

[HoMeZ]

Originally posted by: Dm301

Originally posted by: HoMeZ
How do you tell if your ram runs at CL 2 or CL 2.5?

Check your BIOS, it usually tells you there.

Thanks and if it is at 2.5 how do I o/c it to 2? Just change it in bios?