memory frequency

[cookiemonster]

Hi just noticed my memory in the bios says:- Memory Frequence 1330.61 is this right the memory i have installed is

16GB (2x8GB) Corsair DDR3 Vengeance Low Profile Jet Black, PC3-12800 (1600), Non-ECC, CAS 10-10-10-27, XMP, 1.5V

System is,

NZXT Lexa S
Intel Core i5 3570K,1155, Ivy Bridge, Quad Core, 3.4GHz,
Gigabyte GA-Z77X-UP5 TH Socket 1155 VGA DVI HDMI Dual Thunderbolt 7.1 Channel Audio ATX Motherboard
XFX HD 6970 ATI - AMD Radeon Graphics Card - 2GB
16GB (2x8GB) Corsair DDR3 Vengeance
256GB Crucial RealSSD M4, 2.5" SATA
Western Digital 750gb Hard Drive SATA111 7200rpm 64MB Cache-OEM Caviar Black
Corsair 750 PSU
Cooler Master Hyper 212 EVO CPU Cooler
Liteon DVD Writer
24” Samsung SM2433BW Black Widescreen LCD, 1920x1200
5.1 Creative Surround Speakers
Logitech G11 Gaming Keyboard
Logitech MX516 Gaming Mouse
Windows 7 Home Premium 64bit
Epson DX8400 All in one.

 

[Jetster]

Look for an option XMP profile in the BIOS and try one. Select it save and exit. Reboot back into the BIOS and check then

 

[lilhasselhoffer]

Expanding upon what Jetster said.

RAM auto detection is spotty, at best. Generally, the system will detect RAM at whatever frequency it wants to. In the case of Intel, that's generally 1333 MHz. You need to manually change the RAM to the appropriate frequency.

Intel instituted its XMP program to certify RAM for overclocking, and to make certain memory profiles available for easier overclocking. In order to change from detected speeds, you want to activate one of the XMP profiles, set the appropriate frequency, and make sure the timings are correct. Good luck, and have fun.

 

[Jack1n]

Thats odd since if it says 1330 that would accually be 2660 effective since DDR is double data rate,can we a screen shot of the memory section in Cpu-z?

 

[brandonwh64]

Thats odd since if it says 1330 that would accually be 2660 effective since DDR is double data rate,can we a screen shot of the memory section in Cpu-z?

It says in the OP,

Hi just noticed my memory in the bios says......

so yea def not CPUz

 

[cookiemonster]

Hi done what you said set it to profile one and it now reads
Memory Frequency 1596.69mhz.

 

[brandonwh64]

Hi done what you said set it to profile one and it now reads
Memory Frequency 1596.69mhz.

Seems like all is well now, Just do some quick benches and stability checks to make sure its stable.

 

[Jack1n]

I have an older motherboard which dosent show effective memory speeds (AM2+ Board) does it accually show the effective clocks in the newer boards?

 

[brandonwh64]

I have an older motherboard which dosent show effective memory speeds (AM2+ Board) does it accually show the effective clocks in the newer boards?

He is telling us the speeds in the bios not from CPUz. CPUz will tell HALF the rated speed that the bios is set. So 1333 will be 667.

 

[Jack1n]

He is telling us the speeds in the bios not from CPUz. CPUz will tell HALF the rated speed that the bios is set. So 1333 will be 667.

So does my bios,it says in the bios 533 but its running 1066 effective.

 

[brandonwh64]

He is probably looking at the HW monitor section of the bios. You might be looking in the OCing section.

Maybe different ways the bios shows the RAM.

 

[cookiemonster]

these are the readings i got

 

[95Viper]

798.2 * 2 = 1596.4 effective speed is correct for 1600.
The variations comes from the timing circuit and could be caused by various reasons.
Your bios page must already calculate this for display.

Test for stability.