4770k with lots of memory

darkip · 19 May 2015 at 00:09

Processor: 4770k (delidded)
Cooler: Noctua NH-D14
Motherboard: Asus Z97-WS (Latest bios, 2304)
RAM: G.Skill F3-1866C8Q-32GTX (32GB, 4x 8GB DIMMs, 1866mhz, 8-9-9-24-2T)
GPU: Asus R9 290x
PSU: Corsair AX1200i
OS: Windows 8.1 64-Bit

I'm struggling to overclock my 4770k very far at all. In fact I think I've got somewhat of a bum chip as I'm having trouble stabilising:

4.3Ghz/3.5Ghz (Core/Uncore) at:

Code:

Vcore:          1.3v
Vcache (Vring): 1.15v
Vin:            1.9v
VCCSA:          +0.15v (~1.016v)
IO Analog:      +0.15v
IO Digital:     +0.15v
LLC:            Level 9
Memory:         Set using XMP (1866Mhz 8-9-9-24-2T)

I run scientific simulations on my machine (which use AVX2) so I'm using the latest prime95 to check stability. Sometimes I'll get 4hrs into a run and then the machine will either BSOD with a 101 or 124, or the prime95 application will crash or error with a rounding error.

I achieved prime95 stability at 4.2Ghz/3.5Ghz using:

Code:

Vcore:          1.29v
Vcache (Vring): 1.15v
Vin:            Auto (~1.74v)
VCCSA:          Auto (~0.808v)
IO Analog:      Auto
IO Digital:     Auto
LLC:            Level 9
Memory:         Set using XMP (1866Mhz 8-9-9-24-2T)

I guess my first question is whether I should be increasing SA and IO voltages for this memory configuration at all? And otherwise any additional changes you'd recommend trying.

Thanks in advance!

darkip · 19 May 2015 at 18:10

Thanks, I'll try doing a run with increased SA/IO and report back.

darkip · 20 May 2015 at 14:04

I'd rather test with prime95 because my simulation won't detect errors so even if the simulation doesn't crash there may be errors.

I'm seeing more 101 bsods than 124s at the moment, even with the increased SA/IO so I'm going to try increasing Vcore like you say. With regards to LLC, I'm already at level 9 (max).

darkip · 20 May 2015 at 15:40

ZXSpectrum said:
How old is the chip?

Purchased: 18 February 2014
Batch#: 3334C048

I guess I might have caught the beginning of the 4790K production.

darkip · 20 May 2015 at 16:16

ZXSpectrum said:
Or Flog it on MM and get a 4790K

Would the latest 4790k batches be any good though?!

darkip · 20 May 2015 at 17:23

Sounds tempting, maybe I'll relegate the 4770k to my HTPC/transcoding machine and pick up a 4790K.

8Pack, does OcUK have any "known good overclocking" batch 4790k's in stock at the moment? Or would I have better luck ordering elsewhere as the good chips have gone to the pre-built rigs

[EDIT]
I'm going to give up on 4.3 with this chip, seems like unreasonable amount of Vcore is required.