DDR2 speed
Originally Posted by
Sonya.T
Hi all, I have a pair of tow Corsair modules each on with a capacitie of
2048 runing at 1066 at CL5-5-5-15 dual chanel interleave..
Now, If I run the system at a lower DDR2 frequency 837 and CL 4-4-4-14 the
system is notably faster. Are ther any problem with my Asus P5Q p45
motrheboard? Or with the Corsair modules?
Thanks in advance
Noticeably faster by what standards?
Have you used a test that examines the memory subsystem transfer rate in
isolation? Sysoft Sandra (a free download) has such tests.
How have you set the BIOS parameters other than the memory internal timings?
Parameters like the relation between the CPU clock and the Memory clock
(synchronous or asynchronous, for example)?
What CPU (particularly the FrontSide Bus speed, but also the size of the L2
cache)?
I think the difference between system performance at DDR2-1066 / CL5-5-5-15
and DDR2-837 / CL4-4-4-14 should be very small (a few percent) IF all other
parameters are the same. The DDR2-1066 / CL5-5-5-15 should be slightly
faster because the delays (CL5-5-5-14 and CL4-4-4-15) are multiples of the
memory cycle time and 5/1066 = 0.00469 is smaller than 4/837 = 0.00478.
Also 15/1066 is smaller than 14/837, but that delay is only incurred when
accessing non-sequential blocks of memory.
Intel Core 2 Quad Q6600 (3.6GHz, 1.44v) with TR Ultra 120E,
Gigabyte GA-EX38-DQ6 v1.1, 4GB G.Skill PI 1066 5-5-5-15 2.1v ,
Powercolor ATI HD4870X2 2GB, 4x SATA2 500GB Samsung HDD RAID 10,
Creative X-Fi, Dell 2408WFP A01 24" LCD,
Acer P221w 22" LCD,
Corsair HX-1000 Watt PSU,
Vista 64-bit.
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