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Old October 2nd 14, 01:39 AM posted to alt.comp.periphs.mainboard.gigabyte
Haines Brown
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Posts: 14
Default memory timing setting

Paul writes:

Haines Brown wrote:
My 16 Gb Skill RAM says to set tCL to 9, tRCD to 9, tRP to 9 and tRAS to
24. When I boot a new board the BIOS by default has timing set
automatically. But I see that it is setting tCL at 11, tRCD at 11, tRP
at 11, and tRAS at 28.

Which set of timings should I accept? Is the difference in these values
significant?


If your RAM features "XMP", your GA-H97-DH3 has XMP in the BIOS.
(Not all RAM has an XMP profile stored in the SPD chip.)


Your kind reply rather goes over my head. My Skill RAM does support XMP,
but it sounds like it is used for overclocking, which I don't wish to
do.

The SPD EEPROM on each DIMM contains timing information. The standard
portion, has several timings, for different clocks. The timings may
not represent the actual module rating, if the actual module rating
falls outside JEDEC values.


Are you saying that the higher timings (slower?) reported by BIOS are
acceptable and not to worry? That is, are you saying that the Skill
specs simply accommodate overclocking?

You can only use CPU-Z, if the machine is stable enough to install or
connect a Windows drive.


Windows drive? I've never had one of these. After leaving DOS, my hard
disks are always set up for Linux only. But if the higher timing values
reported by BIOS are not problematic, I probably need not worry about
CPU-Z.

Haines