My RAM Timing

[Gaurav Krishna]

I ordered these RAM last week and I got it today but I don't know if the timing of the ram is same
or not.

http://www.primeabgb.com/online-price-reviews-india/gskill-ripjawsx-f3-12800cl7d-8gbxm-ram/

DIMM # 1
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL7-4GBXM
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 5.0-5-5-14-19 @ 380 MHz
JEDEC #2 6.0-6-6-17-23 @ 457 MHz
JEDEC #3 7.0-7-7-20-27 @ 533 MHz
JEDEC #4 8.0-8-8-22-30 @ 609 MHz
JEDEC #5 9.0-9-9-24-33 @ 666 MHz
JEDEC #6 10.0-9-9-24-33 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Max CL 7.0
Min tRP 9.63 ns
Min tRCD 9.63 ns
Min tWR 15.00 ns
Min tRAS 29.63 ns
Min tRC 39.63 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 7.0-8-8-24-32-2T @ 800 MHz (1.500 Volts)

DIMM # 2
SMBus address 0x53
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL7-4GBXM
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 5.0-5-5-14-19 @ 380 MHz
JEDEC #2 6.0-6-6-17-23 @ 457 MHz
JEDEC #3 7.0-7-7-20-27 @ 533 MHz
JEDEC #4 8.0-8-8-22-30 @ 609 MHz
JEDEC #5 9.0-9-9-24-33 @ 666 MHz
JEDEC #6 10.0-9-9-24-33 @ 666 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Max CL 7.0
Min tRP 9.63 ns
Min tRCD 9.63 ns
Min tWR 15.00 ns
Min tRAS 29.63 ns
Min tRC 39.63 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 7.0-8-8-24-32-2T @ 800 MHz (1.500 Volts)

 

[molletts]

It looks the same as advertised to me. The 7-8-8-24 in the product description corresponds with the XMP #1 timing (7.0-8-8-24-32-2T @ 800MHz).

 

[Gaurav Krishna]

It looks the same as advertised to me. The 7-8-8-24 in the product description corresponds with the XMP #1 timing (7.0-8-8-24-32-2T @ 800MHz).

so the ram timing is 7-8-8-24 but the ram speed is 1333Mhz?

 

[molletts]

so the ram timing is 7-8-8-24 but the ram speed is 1333Mhz?

It's 7-8-8-24 at 1600MHz (800MHz × 2).

If you're planning to run the memory at 1333MHz, you'll need to be a bit inventive with the timings as there isn't an XMP profile for 666/1333. You might be able to use the 6-6-6-17 timings from the JEDEC profiles; failing that, the 7-7-7-20 ones should work. Or you could start with the fastest timings that work (test them thoroughly with Memtest86) and try tightening them up a bit at a time until you find where it stops working. You may have to back off a little once you find the fastest timings that work in Memtest because real-world memory access patterns are very different.

(The JEDEC 666MHz timings - 9-9-9-24 - are very conservative. Given that it's capable of 7-8-8-24 at 800/1600, you should be able to tighten up the timings considerably.)

 

[Gaurav Krishna]

so the ram timing is 7-8-8-24 but the ram speed is 1333Mhz?

It's 7-8-8-24 at 1600MHz (800MHz × 2).

If you're planning to run the memory at 1333MHz, you'll need to be a bit inventive with the timings as there isn't an XMP profile for 666/1333. You might be able to use the 6-6-6-17 timings from the JEDEC profiles; failing that, the 7-7-7-20 ones should work. Or you could start with the fastest timings that work (test them thoroughly with Memtest86) and try tightening them up a bit at a time until you find where it stops working. You may have to back off a little once you find the fastest timings that work in Memtest because real-world memory access patterns are very different.

(The JEDEC 666MHz timings - 9-9-9-24 - are very conservative. Given that it's capable of 7-8-8-24 at 800/1600, you should be able to tighten up the timings considerably.)

No I don't want to use it at 1333Mhz I want to use it at 1600Mhz with timing 7-8-8-24 or lower if possible
so it's 7-8-8-24 at 1600Mhz then it's fine but I'll try to change timing if it's necessary

 

[Tradesman1]

What mobo and CPU? If Intel simply go to BIOS and enable XMP then select profile 1. It may depend on if your CPU can run the sticks, these are high performance DRAM 😉

 

[Gaurav Krishna]

What mobo and CPU? If Intel simply go to BIOS and enable XMP then select profile 1. It may depend on if your CPU can run the sticks, these are high performance DRAM 😉

MSI 970a-g43
AMD FX 4300(3.80)

 

[Tradesman1]

If mobo supports XMP can try that or else set manually to 1600 9-9-9-25 1.55