I'm now running 4.2GHz, lets see how this goes with stability.

Using fixed voltages:

CPU Vcore = 1.24V
Vin = 1.75V
Vring = 1.15V

RAM is at XMP profile1 2400 auto timings @1.65V.

Side note:
Previously with auto voltages, I could set 4.2GHz, but the CPU never went above 3.8GHz in testing.

-- Craig

[QUOTE=TheMawn;357023]George: Get a bootable copy of memtest86+ and run it overnight at least.[/QUOTE]

No joy. Got version 5.01 and used F2 to get the multithread test (the only way to saturate memory bandwidth is with 4 threads). The program hangs on Test #7, pass = 21%, test = 75% every time. Apparently I'm not alone -- highly likely this is a program bug.

Try 4.20 as well. Just to see. You can't rule out the IMC being crippled but you can at least test the DIMMs to some extent, maybe. If you want. Else you can keep following version 5 to see if they fix that.

A little off topic but I have a doubt concerning a i7-4770 budget. I asked for one with 1600 MHz memory but I see people here with 2400 MHz memory. When I look at the Intel page about the processor it says "memory types: DDR3-1333/1600". So my question is, will I take advantage of the 2400 MHz DDR3 memory? I'll use the machine to do some LLR testing on RPS project. I would like to know if I should make an investment on 2400 MHz memory or not. Here where I am everything is expensive.

Thank you a bunch.

Carlos

[QUOTE=pinhodecarlos;357164]A little off topic but I have a doubt concerning a i7-4770 budget. I asked for one with 1600 MHz memory but I see people here with 2400 MHz memory. When I look at the Intel page about the processor it says "memory types: DDR3-1333/1600". So my question is, will I take advantage of the 2400 MHz DDR3 memory? I'll use the machine to do some LLR testing on RPS project. I would like to know if I should make an investment on 2400 MHz memory or not. Here where I am everything is expensive.[/QUOTE]

Yes. At 1600 MHz I get zero increase in performance running the 4th core of the i7-4770. 2400 MHz should be enough to keep 4 i7-4770 cores fully busy.

[QUOTE=Mark Rose;357186]Yes. At 1600 MHz I get zero increase in performance running the 4th core of the i7-4770. 2400 MHz should be enough to keep 4 i7-4770 cores fully busy.[/QUOTE]

Can a non-K 4770 run memory faster than 1600MHz?

[QUOTE=Prime95;357191]Can a non-K 4770 run memory faster than 1600MHz?[/QUOTE]

I don't have memory rated above 1600 MHz to properly test, unfortunately. I had tried clocking it higher in the past but ended up with POSTing issues. I thought I had set it properly before but then I realized I only booted after the defaults had been loaded.

So I don't know.

[QUOTE=Mark Rose;357186]Yes. At 1600 MHz I get zero increase in performance running the 4th core of the i7-4770. 2400 MHz should be enough to keep 4 i7-4770 cores fully busy.[/QUOTE]

Note that Carlos is asking about much smaller FFT sizes than Prime95 runs. Over at RPS, we're testing exponents mostly in the 2-4M range, so memory demands are much less intensive. Mark, are your 3 cores saturating the memory bus on Prime95? What exponent or FFT size?

[QUOTE=VBCurtis;357212]Note that Carlos is asking about much smaller FFT sizes than Prime95 runs. Over at RPS, we're testing exponents mostly in the 2-4M range, so memory demands are much less intensive. Mark, are your 3 cores saturating the memory bus on Prime95? What exponent or FFT size?[/QUOTE]

The FFTs will be smaller but the exponents are too. If your iterations happen faster the memory demands will go back up, won't they?

[QUOTE=Prime95;357191]Can a non-K 4770 run memory faster than 1600MHz?[/QUOTE]

That's my understanding, to overclock mem requires a 'K' part.

I noticed improvements with increasing mem speed not just in prime95 but general usage.

-- Craig

[QUOTE=VBCurtis;357212]Note that Carlos is asking about much smaller FFT sizes than Prime95 runs. Over at RPS, we're testing exponents mostly in the 2-4M range, so memory demands are much less intensive. Mark, are your 3 cores saturating the memory bus on Prime95? What exponent or FFT size?[/QUOTE]

Your are right but then on my laptop with memory at 1600 MHz I can only run two instances of LLR without losing 30-50 % of iteration when adding the other two cores at n=3.7M
Also I have Prime95's doubt, "can a non-K 4770 run memory faster than 1600MHz?"

Carlos