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Can the chip markings identify CL2 memory?

CZroe

CZroe

Lifer
I bought some Micron memory & I can't remember if I paid the tad bit extra for the CAS2 memory.
No need to run it slower than it's rated. Can I tell if it's CAS2 rated from the chip markings? If so, I'll post 'em...

Thnx
 
Normally no.

If it is CL2/CAS2 RAM, the SPD in the BIOS will show that CAS Latency will be set to 2T/2Clocks.
 
YES YES YES YES YES.
All chip markings identify its CL rating.
Mircon, Infineon, Samsung, Hynix (Hyundai), etc all DO.
Go to the manufacturer website, they've datasheet or marking decoder ready for you to identify it.
 
I found that the major companies do the marking thing. The Generic ones may or may not... Usually the Cas rating is the last number though...
 


<< I found that the major companies do the marking thing. The Generic ones may or may not... Usually the Cas rating is the last number though... >>

All chips have the "markings", which are put on by the fab (ie. Micron, Hyundai, Infineon, etc.). So either name brand or generic memory will both have the "markings", none of which are put on by any generic module fabricators. Now if you're talking about the rating labels you sometimes see on DIMMs, then yes, those may be put on by either a name brand or a generic module fabricator, but as for the markings on the modules' chips themselves, those are put on at the chip fabs.



<< -8E = PC100, CAS2
-7E = PC133, CAS2
-75 = PC133, CAS3 >>

Yep, that's correct for Micron chips.
 


<< Can the chip markings identify CL2 memory? >>

The CAS Latency of a memory module is programmed into the SPD by its manufacturer. The most reliable way to determine is to use a SPD read utility such as SPDINFO.EXE that comes with SANDRA 2001 PRO.

The chip has no built-in latency, but the manufacturer of the chip does specify the latency support at 66/100/133 frequencies for each chip. Infineon is more conservative than Micron. For example, for their SDRAM 7.5 ns chips, Infineon only spec it for PC133 at 3-3-3, but Micron spec theirs for PC133 at 2-2-2. From the actual experience on this forum, the Infineon usually overclocks to much higher frequency than the Micron at CL2. Therefore, you can use the chip marking as a general indication, but not a direct specification of the module.

The Mushkin PC133 Rev3 SDRAM is usually regarded as one of the highest performance memory. It uses the Infineon PC133 3-3-3 chip. Mushkin hand selects them for PC133 2-2-2 and programs the SPD accordingly.
 
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