Cas Latency?

H

Happy_Demon

New Member
What is "Cas Latency?," and how do I know which is better in that department. Also, which is the best option in making a gigabyte of memory, in which I have these two options: 2 of the 512MB model or 1 of the 1GB model, with the only differences being price and cas latency.

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Wintec AMP-X 240-pin 512MB DDR2 PC2-5400 with Heat Spreader, 1 Rank, Model 3AXD2675-512M1S-R - Retail

Model# 3AXD2675-512M1S-R
Item # N82E16820161645
Specifications:
Manufacturer: Wintec
Speed: DDR2-675(PC2-5400)
Type: 240-Pin DDR2 SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 4
Support Voltage: 1.8V
Bandwidth: 5.4GB/s
Organization: 32M x 64 -Bit
Warranty: Lifetime

$133.00 x 2 = $266.00

vs.

OCZ Performance Series 240-Pin 1GB DDR2 PC-5400, Model OCZ26671024PF -RETAIL

Model# OCZ26671024PF
Item # N82E16820227009
Specifications:
Manufacturer: OCZ Technology
Speed: DDR2-667(PC2-5400)
Type: 240-Pin DDR2 SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 4-4-4-8
Support Voltage: 1.8V
Bandwidth: 5.4GB/s
Special Features: 2.2V EVP
Warranty: Lifetime

$366.00
 
Happy_Demon said:
What is "Cas Latency?," and how do I know which is better in that department. Also, which is the best option in making a gigabyte of memory, in which I have these two options: 2 of the 512MB model or 1 of the 1GB model, with the only differences being price and cas latency.

-----------

Wintec AMP-X 240-pin 512MB DDR2 PC2-5400 with Heat Spreader, 1 Rank, Model 3AXD2675-512M1S-R - Retail

Model# 3AXD2675-512M1S-R
Item # N82E16820161645
Specifications:
Manufacturer: Wintec
Speed: DDR2-675(PC2-5400)
Type: 240-Pin DDR2 SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 4
Support Voltage: 1.8V
Bandwidth: 5.4GB/s
Organization: 32M x 64 -Bit
Warranty: Lifetime

$133.00 x 2 = $266.00

vs.

OCZ Performance Series 240-Pin 1GB DDR2 PC-5400, Model OCZ26671024PF -RETAIL

Model# OCZ26671024PF
Item # N82E16820227009
Specifications:
Manufacturer: OCZ Technology
Speed: DDR2-667(PC2-5400)
Type: 240-Pin DDR2 SDRAM
Error Checking: Non-ECC
Registered/Unbuffered: Unbuffered
Cas Latency: 4-4-4-8
Support Voltage: 1.8V
Bandwidth: 5.4GB/s
Special Features: 2.2V EVP
Warranty: Lifetime

$366.00
Click to expand...

Well you could save yourself 1 more space for ram with the 1 ram module (pricier though :( ) But, the other one might work better if they dual channel i guess...
 
Does having more numbers make it better? I see that having the lower number helps, but what do the others mean? Thanks for any help.
 
Happy_Demon said:
Does having more numbers make it better? I see that having the lower number helps, but what do the others mean? Thanks for any help.
Click to expand...

Not sure what you mean but, I heard that 2-2-2-5 and 2.5 is the best latency, hope this helps...
 
If you have two memory modules that are of of the same size and from the same manufacturer, I would definitely recommend 2 X 512MB. If you look at your motherboard manual, it will tell you which slots to place the RAM in to achieve DUAL CHANNEL MODE. This is where you can get more memory bandwidth with 2 similar DIMMS rather than just 1 DIMM (sort of running in parallel scenario).

As other people have said, the timings represent different types of latency (how many clocks it takes). Generally speaking, the best option is to go for the lowest latency RAM. The CAS latency is really the most important. Try for CAS 2 (2-x-x-x) or CAS 2.5 (2.5-x-x-x). This generally means more efficient RAM.
 
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