Memory Timings Help.

[Faztastic]

Hey guys ive just o/c my core i5 750 to 3ghz with stock cooler, mild but stable. and i have loaded the xmp profile for my corsair xms3 1600mhz.

the timings are 9 9 9 24

if i want to lower them would it be just as simple as going into bios and putting

8 8 8 20 and it should be fine?

or do i need to tweak any volts.

 

[Faztastic]

Processor 1 ID = 0
Number of cores 4 (max 8)
Number of threads 4 (max 16)
Name Intel Core i5 750
Codename Lynnfield
Specification Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
Package (platform ID) Socket 1156 LGA (0x1)
CPUID 6.E.5
Extended CPUID 6.1E
Core Stepping B1
Technology 45 nm
Core Speed 3052.5 MHz
Multiplier x FSB 19.0 x 160.7 MHz
Rated Bus speed 2891.8 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


Northbridge Intel DMI Host Bridge rev. 11
Southbridge Intel P55 rev. 05
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR3
Memory Size 4096 MBytes
Channels Dual
Memory Frequency 803.3 MHz (2:10)
CAS# latency (CL) 9.0
RAS# to CAS# delay (tRCD) 9
RAS# Precharge (tRP) 9
Cycle Time (tRAS) 24
Row Refresh Cycle Time (tRFC) 89
Command Rate (CR) 2T
Uncore Frequency 2570.5 MHz

 

[1Day]

Unless you have very good ram it is not quite as simple as dropping each of the latencies down to 8.

You will have to test each of the settings to determine what your ram can do.

Above is a set of ram that is running at Css 6- notice that the settings are 6-9-6 and not 6-6-6. I was unable to lower all the latencies. So 6-9-6 was the best I could do at 2000MHz on 1.65 volts.

 

[VFM Addict]

As a rough rule of thumb, and assuming the normal way we sequence, numbers on the right are least significant numbers on the left most significant.

Personally I would try for 8, 8, 8, 20 first off with a slight vdimm increase. If that didn't work then maybe a two notch increase if I had some active cooling on the ram and the vdimm steps in my bios weren't too massive.

Unless you're prepared to put in an awful lot of work and a lot of stability testing it probably isn't worth the effort unless you can get to 8, 8, 8, 20 and even then the performance increase will not be dramatic and only exist in benchmarks not in real world noticability.

 

[adrichardson81]

I'd agree with that. Unless it's substantial (eg c9 to c7), you won't notice a real-world difference. When I went though my last round of ocing I went from 7/7/7/24 to 8/8/8/25. I can honestly I say if it hadn't been for CPUZ, I wouldn't have noticed the difference.