How do you change the bios settings for ram to 1600hz on a p7h55 m pro

I have just put togther my first pc in over 4 years. Thort everying was going well untill i tryed to switch it on. It then desided just start for about 1-2 seconed the off and on like this untill i turn the power of at the back.

I read the user manul further and descoved the wilst the p7h55 m pro compatble for 1600hz and higher, it only gose to 1333hz as stock. I hope this is the reason why it is rebooting but a seconed opinion?

In the hope that this is the case i have orderd a DDR3 1gig 1333 to alow me to boot so that i can accsess the BIOS. From there (and beforei install windows 7) can set the BIOS to get the mother board to accpete the DDR3 2gig 1600hz 1.65 x2?

Any help on this would grate as it is driving me crazzy.

o and here the rest of the componts:
Intel Core i5 750 2.66GHz Socket LGA1156 8MB L3 Cache Retail Boxed Processor
OCZ StealthXstream II 600W Power Supply
Seagate ST31000528AS 1TB Hard Drive SATAII 7200rpm 32MB Cache - OEM
ASUS P7H55-M PRO H55 Socket 1156 i5/i7/i3 DVI VGA HDMI Out 8 CHannel Audio MATX Motherboard
Arctic Cooling Freezer 7 Pro rev 2 Socket 775, 1156, 1366, AM2, AM3 Heatpipe CPU Cooler

OCZ 4GB (2x2GB) DDR3 1600MHz Intel Exteme XMP memory Kit CL8(8-8-8-24) - What i want to use.

Kingston 1GB DDR3 1333MHz i5 Memory Module CL9 1.5V - What iv orderd to gain BIOS accsess

If some one can addvise me if im on the right track or if there any other threds on this.

Andy R
8 answers Last reply
More about change bios settings 1600hz p7h55
  1. I've used your motherboard before for my i5-750 build. You'll need to play around with the BIOS. For me, I had my CPU at 3.8ghz - here's what I did to get the RAM at 1600mhz:

    Set multiplier to x19
    Set BLCK frequency to 200

    You will need to adjust the BLCK frequency and the RAM frequencies as well to find some suitable numbers - play around.
  2. Ok thanks il give that a go when I get bios accsess.

    Do you think the DDR3 1gb 1333hz that iv ordered will allow me to boot? At the moment with the DDR3 2gb 1600hz it just reboot after 1-2 seconds.

    Thanks for the help, I'm new forum posts too. So been a bite of a learning trip.
  3. 1333 will ensure that the RAM will work since it's supported by both the processor and motherboard. For now, I would say play around with the BIOS and the BLCK frequencies. Pay attention to what it does to your CPU clock speeds as well.
  4. Oh and one stick of 1GB should still boot up fine.
  5. Right well the 1333 will arrive Monday so will post again after.
    Once again thanks for help, and any more addvice you have on overclocking i5 750 would handy.
  6. I'll post a screenshot of my BIOS' settings with my i5-750 at 3.8ghz and my RAM at 1600mhz shortly.
  7. I am not confident that the issue will be fixed using another set of ram, as the memory you are currently using should work, it would likely be set to run at default speeds compared to the CPU (if you installed them in the correct DIMM slots, do check the manual), and you will have to play around with the settings to get them to run at 1600 MHz.

    If you have installed the memory correctly, do go through this troubleshooting list, to find the cause for the restarts.
  8. Here's a BIOS screenshot from my GA-P55A-UD3. I've used a P7P55D in the past, and although the layout is different, the things that you'll want to be looking out for as outlined in red below remains the same on both boards.

    RAM rated at 1600mhz from the box won't immediately run at 1600mhz once plugged in, so you will have to play around with the settings to get it at 1600mhz. Make sure that your memory frequency is set to 1333 before you change anything else as well - we'll want to bump it to 1600 after upping the BLCK frequency as shown above.
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