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Joined: Jan 2002
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Any know what CL4 is when it comes to RAM? I am trying to upgrade a G5 and the RAM with CL4 in the title seems to be cheaper. Thanks.
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Joined: Jul 2003
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Hard-core CEG\'er
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Latency?
I think the lower numbers are better if that's the case.
Of course, I could be talking out of my ass on this one...
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Joined: Oct 2003
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Hard-core CEG\'er
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i think CL4 is short for CAS Latency 4 clock cycles. but i too could be wrong  ~Andrew
2001 VW Jetta Wolfsburg Edition
20 valves of fury
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Joined: Nov 2003
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Yeah, it's the CAS Latency. CL4 is damn slow though.
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Joined: Jan 2002
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Good to know. So I should say away from CL4.
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Joined: Apr 2005
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CEG\'er
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CEG\'er
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Originally posted by CSVT1214:
Yeah, it's the CAS Latency. CL4 is damn slow though.
Indeed.
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Joined: May 2005
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Veteran CEG\'er
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Originally posted by g r y m e s:
Good to know. So I should say away from CL4.
Yes. The CAS latency number refers to the number of clock cycles that elapse between the time that the memory controller requests to read a memory location and the time that that data is returned - so obviously, lower numbers are better. There is actually a series of 4 numbers for measuring RAM latency, of which CL (CAS latency) is the first. I don't remember what all 4 numbers mean, but a decent timing to look for is something like 2-3-3-6. Of course, it may be to your advantage to calculate the actual latency times (in nanoseconds) to be able to compare the latencies of RAM chips of varying speeds (for example, DDR2 chips have much higher latency ratings but due to their faster clock speed, are faster when compared in terms of nanoseconds). I don't know much about the G5, but if the clock speed of the memory you're looking at is 800MHz or higher then a CAS latency of 4 is actually pretty good.
E0 Silver Frost CSVT #3095/6535
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Joined: Oct 2004
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CEG\'er
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CEG\'er
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Yes, the CL 4 stands for CAS Latency 4 which is BAD. The lower the better. The Latency consists of 4 numbers as previously mentioned. The first one is the column access time number, the second one is the time to switch between memory banks, the third is the time to prepare for output and the last is time for row access. (The last one you usually want it to be set at, at least the first number + the third number + 2) For the 4th number, lower is NOT better.
In short, stay away from CL4.
2001 Volvo S40-Perrin MBC@ 11psi, EST intake, 35% tint, still slow
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