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When Lowering Ram Clk, Do i need to lower ram speed?

post #1 of 6
Thread Starter 
As title states, trying to find my ram's sweetspot before i start pushing the buses and cpu.
Using Corsaid Vengeance Blue's 2x4gb sticks.

9-9-9-24- rRc 34 is stock setting on auto. JEDEC #4 666mhz (per cpu-z)
noticed when i check my memory through cpu-z i see jedec #2,3,4 and XMP-1600.

using bios, i brought memory down to JEDED #3 592mhz
8-8-8-22-30. ran p95 for 12+ hours (mem speed at 666.7mhz.)
no issues.

today dropps it to jedec #2 7-7-7-19-27 518mhz (still running at 666.7 though) started p95, crashed almost instantly. so i have 2 questions.
do i need to drop the frequency down a notch (or 2) for 7 or lower clk timings? or is 8 the lowest i can go?

2nd question, when cpu-z says jedec #? (frequency xxx) does that mean i SHOULD be running it at that speed? and does that mean that since i'm currently running 8-8-8-22-30 (jedec #3 freq 592) i'm actually over clocking my memory by 74mhz? (i.e. Should run at 592, actually running at 666. so 666-592 = 74mhz over clock?


thanks for the help in advance.
post #2 of 6
You'll want to OC the CPU before the RAM. In general, even a slight OC to the CPU will be much more advantages than a bump in RAM speed or timings. You should clock your memory fairly low, and then max the CPU OC, and then try bringing your memory back up.

P95 is a poor test for memory. Use something like MemTest86+. That actually tests your memory. P95 is better for testing CPU load with concurrent memory swapping, but tells you more about the stability of your memory bus than your memory itself.

The different JEDECs are basically the different manufacturer approved settings for the memory. If you aren't running at one of those, you are over/underclocking.
post #3 of 6
Try to put some voltages like 1.65v to 1.8v this voltages are safe for any DDR3 ram. Also try something like that for 666MHz 7-7-7-20-27 or 7-8-7-20-27(it will work on 30 too if you want more stability).
    
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CPUMotherboardGraphicsRAM
AMD Phenom II x4 925 C2 2.8@3.7GHz NB 2.65GHz 1... Asrock 970 Extreme 4 UEFI Palit GTX 460 Sonic Platinum 840MHz Core/1055MH... 2x4GB Kingston HyperX 1600@1414MHz 7-7-7-21 1.65v 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda 1TB 7200RPM 32MB Sata 3 6GB/s Sony Optiarc 5260s 24X DVD+/-RW Cooler Master Hyper TX3 / AMD Stock fan as VRM ... Windows 7 Ultimate x64 
MonitorPowerCase
Samsung SyncMaster S24B300HL 1920x1080 Cooler Master GX 750W Cooler Master Elite 430 Black 
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post #4 of 6
Thread Starter 
hey nick, when you say clock low, do you mean lower timings? or raise timings? only asking because lower timign is "quicker" higher timings is "slower," BUT lowers memory freq. thanks for the help. only reason i started doing it this way is to find a stable low clock memory speed, read a guide where someone did his memory side first since it's "harder to tweak?" might of read that wrong.
post #5 of 6
Quote:
Originally Posted by Clos View Post
hey nick, when you say clock low, do you mean lower timings? or raise timings? only asking because lower timign is "quicker" higher timings is "slower," BUT lowers memory freq. thanks for the help. only reason i started doing it this way is to find a stable low clock memory speed, read a guide where someone did his memory side first since it's "harder to tweak?" might of read that wrong.
By "clock" I meant generically to make the RAM slower, because slower usually means more stable. So loosen (raise) the timings and lower the frequency.
post #6 of 6
Thread Starter 
ahhh. gotcha. thanks for the help. I'll hit up here again if i need more insight
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