Memory specification

mark winslow · 12-31-2006, 11:09 AM

What does CL2.5 designate in regards to RAM?

ie: PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory

what is the difference between this and PC2700 Non-Parity DDR SDRAM SODIMM Memory?

StrangleHold · 12-31-2006, 02:12 PM

Another common marketing term attached to SDRAM modules is either "CAS2" or "CAS3". Unfortunately, this is a misnomer; these should be called CL2 or CL3, since they refer to CAS Latency timings (2 clocks vs. 3 clocks). The CAS Latency of a chip is determined by the column access time (tCAC). This is the time it takes to transfer the data to the output buffers from the time the /CAS line is activated.

[-0MEGA-] · 12-31-2006, 02:16 PM

Quote:

Originally Posted by StrangleHold

Another common marketing term attached to SDRAM modules is either "CAS2" or "CAS3". Unfortunately, this is a misnomer; these should be called CL2 or CL3, since they refer to CAS Latency timings (2 clocks vs. 3 clocks). The CAS Latency of a chip is determined by the column access time (tCAC). This is the time it takes to transfer the data to the output buffers from the time the /CAS line is activated.

It does say CL, not CAS...

Since you already explained it, im not going to explain it again, but the lower the better

mark winslow · 12-31-2006, 08:03 PM

so there mis no difference between a RAM that is speced at PC2700 Non-Parity DDR SDRAM SODIMM Memory and PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory ?

[-0MEGA-] · 12-31-2006, 08:04 PM

Theres really not, although the first one may have a higher Cas Latency.

fade2green514 · 12-31-2006, 08:23 PM

well, memory is required to take a break basically so its 2nanoseconds versus 3 nanoseconds. it doesnt effect overall bandwidth nominally...
they also added 2.5 into some memory modules to add stability but keep some performance. most pre-builts have timings that look something like 3-3-3-8 for ddr and 5-5-5-15 for ddr2... which is very high. like i said, it doesnt matter a whole lot... they just do this for pre-builts because it adds stability and greatly decreases chance of a system crash ever happening in the future.

12-31-2006, 11:09 AM	#1 (permalink)
mark winslow Bronze Member Join Date: Jul 2006 Posts: 44	Memory specification What does CL2.5 designate in regards to RAM? ie: PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory what is the difference between this and PC2700 Non-Parity DDR SDRAM SODIMM Memory?

12-31-2006, 02:12 PM	#2 (permalink)
StrangleHold VIP Member Join Date: Nov 2005 Posts: 11,181	Another common marketing term attached to SDRAM modules is either "CAS2" or "CAS3". Unfortunately, this is a misnomer; these should be called CL2 or CL3, since they refer to CAS Latency timings (2 clocks vs. 3 clocks). The CAS Latency of a chip is determined by the column access time (tCAC). This is the time it takes to transfer the data to the output buffers from the time the /CAS line is activated. __________________ NZXT Apollo S75QB 750W ZEROtherm FZ120 Phenom II 720BE (X4) 3.5GHZ. Gigabyte GA MA790X UD4P G Skill DDR2 1066 4GB. MSI GTS 250 Seagate 7200.12 500GB. Welcome to the show

12-31-2006, 08:04 PM	#5 (permalink)
[-0MEGA-] VIP Member Join Date: Nov 2004 Location: Goffstown, NH Age: 21 Posts: 28,949	Theres really not, although the first one may have a higher Cas Latency. __________________ Core 2 Quad Q9550 @ 4.1GHz Asus Rampage Formula X48 ATI 4870 X2 2GB GDDR5 4GB (2x2GB) DDR2 960 300GB Raptor // 2x 750GB Creative SB X-Fi Titanium Fatal1ty SilverStone 750W +12V@60A 3DMark06: 22605 www.photosbygeoff.com

12-31-2006, 08:23 PM	#6 (permalink)
fade2green514 Diamond Member Join Date: Nov 2005 Location: buffalo ny Age: 20 Posts: 3,651	well, memory is required to take a break basically so its 2nanoseconds versus 3 nanoseconds. it doesnt effect overall bandwidth nominally... they also added 2.5 into some memory modules to add stability but keep some performance. most pre-builts have timings that look something like 3-3-3-8 for ddr and 5-5-5-15 for ddr2... which is very high. like i said, it doesnt matter a whole lot... they just do this for pre-builts because it adds stability and greatly decreases chance of a system crash ever happening in the future. __________________ Core 2 Quad Q6600 @ 3ghz HD 4850 512mb (750/2350mhz) 2x2gb G.Skill ddr2-835 (5-4-4-10) 2x320gb sata2 in RAID 0 system drive 250gb sata2 storage drive 13,574 - 3dmark06 score

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12-31-2006, 08:03 PM	#4 (permalink)
mark winslow Bronze Member Join Date: Jul 2006 Posts: 44	so there mis no difference between a RAM that is speced at PC2700 Non-Parity DDR SDRAM SODIMM Memory and PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory ?

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