Quick memory question about timings

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roaf85

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Jan 8, 2005
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Have DDR1333 ram (was cheaper than 1066 and wanted to future proof) running alongside a Q9450 on a P43 board at 400 FSB. Refuse to up voltage on my processor as I do not own the processor.

Anyways running 400 with a 3:4 divider with the ram at 533 mhz (1066) at 7-7-7-18. I had to drop it down to 1066 speeds because no boot with ram at 667 mhz and FSB at 400.

I was thinking about dropping the ram mhz lower to say 451 speeds and trying to go for the tightest timings, like 6-6-6-15 or I can leave it where it is now at 533 mhz.

Any suggestions?
 
I am kinda in the same boat as you about Memory right now....should I stick with 1066mhz or goto 1600mhz with slower latancy timings....

I think the answer is to benchmark bascially and see what gives you the edge in your specific system...
 
Since you have higer bandwidth, I would leave it higher (1066 or 1333) and tighten the timings there. You computer will be able to use the bandwidth of the higher speed ram, and the lower timings will help some as well. I personally would not go lower than 1066 in ram speed.
 
Tight timings do not make much of a difference on Core 2 based systems. I'd go for maximum bandwidth if it were me.
 
All right thanks guys. I could not get the computer to boot at DDR1333 speeds with a FSB of 355 or more. So I lowered it to 1066 and went up to 400 stable. 420 it was crashing so for the divider I bumped it back to 400.

I would up the voltage on my processor, but I do not own the processor and it is on loan.
 
hummm what about in my case on the i7 920. I didnt know I can lower the timings on the memory while keeping the 1600mhz. I thought i had to stick to the timings listed in the XMP data on my memory for 1600mhz.

Processor 1 ID = 0
Number of cores 4 (max 8)
Number of threads 8 (max 16)
Name Intel Core i7 920
Codename Bloomfield
Specification Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
Package (platform ID) Socket 1366 LGA (0x1)
CPUID 6.A.5
Extended CPUID 6.1A
Core Stepping D0
Technology 45 nm
Core Speed 2804.9 MHz
Multiplier x FSB 21.0 x 133.6 MHz
Rated Bus speed 3205.5 MHz
Stock frequency 2666 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x
L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 4 x 32 KBytes, 4-way set associative, 64-byte line size
L2 cache 4 x 256 KBytes, 8-way set associative, 64-byte line size
L3 cache 8 MBytes, 16-way set associative, 64-byte line size
FID/VID Control yes


Memory Type DDR3
Memory Size 6144 MBytes
Channels Triple
Memory Frequency 801.4 MHz (2:12)
CAS# latency (CL) 9.0
RAS# to CAS# delay (tRCD) 9
RAS# Precharge (tRP) 9
Cycle Time (tRAS) 24
Row Refresh Cycle Time (tRFC) 88
Command Rate (CR) 2T
Uncore Frequency 3205.5 MHz


DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 2048 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CM3X2G1600C9
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 8.0-8-8-22-30 @ 592 MHz
JEDEC #3 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.650 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 11.25 ns
Min tRCD 11.25 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 50.63 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-6-6-16-27-2T @ 533 MHz (1.650 Volts)
XMP #2 9.0-9-9-24-41-2T @ 800 MHz (1.650 Volts)
 
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