There was a better article about the "MFR issue" on hwbot.org, I can't find it right now. MFR chips/modules are good for pure clock rate (e.g. memory OC world records), real performance is "not so good".

Interesting.

Note that this is a CAS 12 kit losing to a bunch of CAS 11 kits. The timings were probably 11-13-13-35 versus 12-14-14-35, so there's a bit of a disadvantage right there. Not enough to justify 2933 MHz losing to 2133 MHz but that would account for some of the performance hit.

I'll have to do a bit more research into that. I've seen Trident, TridentX and RipjawsX all having the same frequencies and timings and be within $1-$5 of each other on $100 kits.

Iam looking for FFT blend table for prime 2.81; order in which fft's are tested during blend. Does anyone have it? Thanks.

My Haswell PC is pretty stable @4.2GHz now

I haven't needed to reboot it. I'm sure it was running 1week+ without reboot.

One thing I noticed.

The System Interrupts process was hitting almost 25% usage. It was sucking the life out of the process running on core0.

A workaround I found to reduce this to closer to zero. Re-install the latest intel GPU driver, but don't reboot the PC. The System interrupts process all but disappears. When I reboot the PC - the high usage comes back. Run the gpu driver install, don't select reboot again, close app, system interrupts process goes to 0%.

Go figure :)

OS is windows 8.1

-- Craig

I have been toying with my 4770k.

The hardware is:
300w gold rated Huntkey PSU
MSI Z87-G41 PC Mate board like George's
2x4GB of "Beast" RAM
Arctic Freezer 7
a thin layer of Arctic Silver 5
ATX case with side off.

After "set to default", BIOS settings:
Serial Port off
Parallel Port off
Sound Card off
HT off
AES off
C state stepping off
VM off
Turbo off
Multiplier 100.00
[B]CPU ratio 47[/B]
Ring ratio "auto" (39)
RAM 2400MHz (not XMP)
[B]CPU voltage 1.29v[/B]
Voltage mode "Adaptive"
Everything else "auto"/default

It has been stable for 2 days. However, I pretty sure it is throttling like hell. So I will be looking at reducing the CPU Ratio and CPU voltage in order to reduce heat. :geek:

[QUOTE=paulunderwood;358046]Turbo off
Multiplier 100.00
[B]CPU ratio 47[/B]
[B]CPU voltage 1.29v[/B]
[/QUOTE]

You may want to use CoreTemp or CPUZ to check what clockspeed your CPU is really running at. Not sure about MSI motherboards, but I thought if you put Turbo = Off it won't go past the max non-turbo speed of 3.5GHz.

On v28.1, I'm stable only at 42 multiplier with 1.265V. Mine doesn't throttle as I have a watercooling setup.

I thought that one of the first things to do when overclocking is to turn turbo off, am I wrong?

I am confused. Gentoo /proc/cpuinfo says 3500MHz; llr says just under 4200MHz; but BIOS says 4700MHz :unsure:

[QUOTE=paulunderwood;358122]I am confused. Gentoo /proc/cpuinfo says 3500MHz; llr says just under 4200MHz; but BIOS says 4700MHz :unsure:[/QUOTE]
Gentoo probably always lists the non-OC speed even when OCed. 4200MHz seems a possible. 4700MHz is only set in the BIOS and it is very unlikely that the CPU is acctually running at that speed. I haven't seen Haswells on the forum that can do LL testing with 4200+MHz without issues/throttling.

Linux usually shows the current speed of the processor in /proc/cpu.

If you're running less than full loads on all cores, the 3.12 kernel has more intelligent frequency scaling algorithms.

Using 3.11, my laptop shows the current speeds for my i7-3687U:

2080.000
1976.000
2756.000
3146.000

I would find it strange if Gentoo's flavour of the kernel were not showing the current speeds, unless it's an old kernel without support for the CPU.

[QUOTE=ldesnogu;358119]I thought that one of the first things to do when overclocking is to turn turbo off, am I wrong?[/QUOTE]

It could vary depend on the motherboard. My understanding is an overclock is a type of turbo mode. Just that the max turbo multiplier is higher than usual. So you still get all the benefits of it being able to downclock to save power when there is no load. And once the load comes, it turbos up to the 4.7GHz or whatever overclock you've set.