Overclocking my i5? (well more my RAM for now) =/

[Mr. Orange]

Rig:
Intel Core i5 750 @2.66Ghz
Asus P7P55D P55 Motherboard BIOS @ 0711
4Gb G.Skill Ripjaw DDR3-2000Mhz @ 1333Mhz
Asus ATI Radeon HD4870 Dark Knight GDDR5 512Mb
Creative SoundBlaster X-Fi Xtreme Gamer
Samsung F3 500Gb
Corsair TX-750 Power Supply

Notes:
- Intel Stock Cooler is being used.

Ok. the issue...
Because i want my ram to run at 2000Mhz (because that's what it's rated at...) I have to overclock my i5 as it only supports up to 1333Mhz at stock...
First thing i tried..
BCLK: 200
CPU Multiplier: 13 (makes 2.6Ghz)
Now, I can ramp my RAM up to 2Ghz.
I set the RAM settings manually and rebooted.. Booted Perfectly, until it got to Windows Startup, where it seemed to turn off all my USB devices...: WiFi, Mouse, Keyboard.... So I reverted back to putting everything on Auto(what i believed stock to be) in the BIOS and booted up, I still had no USB devices.. :(
So I went back into BIOS and loaded setup defaults, turned the various PCI devices off(such as: sound, Ethernet ports.) and booted up, and my USB devices are back :).

[Naphta]

You didnt try raising the Vcore?

[Mr. Orange]

You didnt try raising the Vcore?
raising*?
nope, it's on auto, i'm not going to raise, because at the moment it works fine for 2.67Ghz, so i don't think raising it for 2.6Ghz would help..

I tried using the Intel Extreme Tuning Utility in Windows, and it works :), but there was no option to turn EIST off, after this stress test i'll turn it off via the BIOS

[Desertmonk]

every motherboard I've ever seen (no LGA1156 or 1366 though - not used one) you've been able to choose the RAM divider/multiplier/ratio/w.e. you prefer to call it independantly of ANYTHING else.

Therefore can't you simply up your RAM to 2000MHz manually by choosing a (presumably) 1:15 ratio (if bclk is 133 stock)

If DDR3 2000 is anything like DDR2 1066 (I.e. factory overspeced slower chip) then you WILL need to set its voltage & timings (to it's rated settings) manually.

[Mr. Orange]

Ok, i went into the BIOS and i changed one small setting.. changed the multplier from 13 to 14.
Booted up, and same issue, no mouse or keyboard or USB devices.

I'm confused, I figured out where the USB devices seem to turn off, it's during the Windows 7 Boot Screen, right in the middle of it.

I guess i can't use the BIOS to overclock at the moment :(

[wuyanxu]

solution: keep C-state enabled at C6, in CPU configurations.

i had similar issues, it's an Intel chipset issue, search iPhone P55 and you'll see. nothing to do with timing/voltages.

just get good cooling and go for 4Ghz if you want 2000Mhz on your RAM. CPU speed is much more important than RAM speed, proof here (http://www.bit-tech.net/hardware/memory/2009/11/02/intel-lynnfield-memory-performance-analysis/9)

use my settings for 4Ghz:
Bclk: 200Mhz
Multi: Auto
Turbo mode OFF (so it won't go to 4.8Ghz by itself when 1 thread is working)
Memory at 1600Mhz 9-9-9-24 due to lower Vdimm also improves CPU temperature, and Bit-tech's article.
and up a few voltages

another thing to try is disable turbo mode, but keep C-state enabled. then change the CPU multiplier.

[Mr. Orange]

solution: keep C-state enabled at C6, in CPU configurations.

i had similar issues, it's an Intel chipset issue, search iPhone P55 and you'll see. nothing to do with timing/voltages.

just get good cooling and go for 4Ghz if you want 2000Mhz on your RAM. CPU speed is much more important than RAM speed, proof here (http://www.bit-tech.net/hardware/memory/2009/11/02/intel-lynnfield-memory-performance-analysis/9)

use my settings for 4Ghz:
Bclk: 200Mhz
Multi: Auto
Turbo mode OFF (so it won't go to 4.8Ghz by itself when 1 thread is working)
Memory at 1600Mhz 9-9-9-24 due to lower Vdimm also improves CPU temperature, and Bit-tech's article.
and up a few voltages

another thing to try is disable turbo mode, but keep C-state enabled. then change the CPU multiplier.

Cheers, i managed to fix my issue by just downloading the latest BIOS (0911 - only released on the forums until the 7th).

few questions about your 4Ghz.. Why is your multi on auto???
and as for my RAM, well it's rated at 2000Mhz, so i'd like to have it at 2000Mhz, the settings i'll try when my Cooler fixings arrive is:
BCLK: 200
Multi: 20
CPU: 4000Mhz
DRAM: 2000Mhz
vCore: 1.3v
DRAM Timings: 9-9-9-27
DRAM Voltage: 1.65v

[wuyanxu]

what's your CPU default voltage?

i found turning OFF load-line calibration gives a more stable system especially in single/dual threads, i think it's because of returning from C6 state, cores did not have enough voltage due to load-line calibration does not stick to Intel spec.

my multi is set to Auto, with turbo mode disabled, C-state at C6.

what's your cooler?

[Mr. Orange]

what's your CPU default voltage?

I'm not sure, i remember seeing in CPU-Z it went to around 0.8, but i can't remember if it was x9 (due to EIST or not)
at the moment i'm running 2.8Ghz (200x14) at 1.05v with the Intel Stock Cooler


what's your cooler?
Zalman CNPS 9700, i'm just waiting for ZM-CS5a support clips to arrive...

[wuyanxu]

i give my 750 1.45v to make sure it's 100% stable. tested 999 Intel Burn Tests, then 20 on each and every possible combination of core loads. then 24 hours of Prime to make sure long-term stability.

these processors with C-state at C6 are harder to get 100% stable compared to Core2's. i found some times 4 cores may be stable while running 2 threads may not be, simply due to cores going and coming out of sleep.