AMD FX8350 hit wall on OC?

currob · 4 May 2013 at 15:09

My 8350 runs real nice and cool at 4746MHz (21.5*220Bus) and only peaks at 53c on prime 95. My settings are:

Vcore: 1.475
CPU/NB: 1.200
DRAM: 1.500
CPU LLC: Ultra-High
CPU/NB LLC: High
CPU Over-Current: 130%
CPU/NB Over-Current: 120%
CPU Spread Spectrum: Off
CPU PWM Phase Control: Extreme (Mode: T.Probe)

Hardware in sig

If I go up 10MHz on Bus then no longer stable even if I go to 1.500v on vcore

If i go up to 22 on the multiplier then no longer stable even if I up the vcore again

Something else is limiting me and I can't find it, I have tried reducing HT, RAM and NB frequencies and trying for higher CPU clock speed but no luck, even if I go extreme at 1.550v vcore

Any suggestions?

d_brennen · 4 May 2013 at 15:23

~4.75GHz is a pretty respectable clock, might just be the chip's limit. Perhaps post in the Ask 8 Pack section

Jumper118 · 4 May 2013 at 15:28

i have a similar problem with my athlon x2 220 and sempron 145 at 3.8ghz and 3.85ghz, they just seem to hit a wall. i have to under clock the ram and oc the northbrigde as high as it will go on my board to get the extra 50mhz over 3800mhz on the sempron. have you tried putting the bus back to 200mhz and the multi up to 24?

currob · 4 May 2013 at 15:31

Jumper118 said:
i have a similar problem with my athlon x2 220 and sempron 145 at 3.8ghz and 3.85ghz, they just seem to hit a wall. i have to under clock the ram and oc the northbrigde as high as it will go on my board to get the extra 50mhz over 3800mhz on the sempron. have you tried putting the bus back to 200mhz and the multi up to 24?

I'll try it now

currob · 4 May 2013 at 15:42

Nope, even with everything reset to defaults, 24*200MHz fails workers instantly on P95 yet 220*21.5 is rock stable

Maybe it is just the limit for my cpu or the limit the board will power.

Edit: I upped the vcore to 1.500v too

currob · 4 May 2013 at 16:05

Just a thought, I have 2 AMD HD7970's (OC'd) and 4x RAM modules, various power drawing USB devices and 10x 120mm LED Fans, a water cooling pump and a 230mm LED fan pulling power off this board atm, along with an already power hungry CPU now OC'd to 4.75GHz.

I have the 24pin, 4pin CPU, 8pin CPU and Molex PCIe 4pin plugs connected but could it just be I am drawing too much power off the board?

Jumper118 · 4 May 2013 at 17:10

currob said:
Just a thought, I have 2 AMD HD7970's (OC'd) and 4x RAM modules, various power drawing USB devices and 10x 120mm LED Fans, a water cooling pump and a 230mm LED fan pulling power off this board atm, along with an already power hungry CPU now OC'd to 4.75GHz.

I have the 24pin, 4pin CPU, 8pin CPU and Molex PCIe 4pin plugs connected but could it just be I am drawing too much power off the board?

you are drawing a lot of power but you are also putting a lot of power in. I think if your going for a maximum frequency then it might be worth just running 1 stick of ram a one 7970, but if your going for something more usable, every day overclock, then it looks like 4.75 will be the limit, which is very good for a 24/7 oc anyway :cool:

.

currob · 4 May 2013 at 17:21

Cheers Jumper118, I have been running this oc for about 6 months, just got the "I wonder if I can get a bit more" bug

Jumper118 · 4 May 2013 at 17:36

currob said:
Cheers Jumper118, I have been running this oc for about 6 months, just got the "I wonder if I can get a bit more" bug

i've bought 3 cpu's in the past month to mess around with because i can't get a very high oc with FX6200 on my board.

currob · 4 May 2013 at 17:45

Jumper118 said:
i've bought 3 cpu's in the past month to mess around with because i can't get a very high oc with FX6200 on my board.

:O

If you're in Staffordshire then feel free to come round here and try with mine !!

Jumper118 · 4 May 2013 at 17:55

currob said:
:O

If you're in Staffordshire then feel free to come round here and try with mine !!

up in Yorkshire unfortunately, but thanks for the offer

currob · 4 May 2013 at 18:22

OK

Anyone in Staffs want to play with my rig?? Refreshments (man food) supplied to experts and the whole thing photographed and posted here on OCUK ! Get me to 5GHz stable on 8 cores !

1 mile from Junction 13 of M6... More food and drink than you can dream of !!!

The person who gets me to 5GHz Prime95 Stable OC will receive a £20 OCUK Voucher !

Terms: max 1.525v CPU vcore

currob · 4 May 2013 at 19:31

ussie · 4 May 2013 at 22:24

currob said:
My 8350 runs real nice and cool at 4746MHz (21.5*220Bus) and only peaks at 53c on prime 95. My settings are:

Vcore: 1.475
CPU/NB: 1.200
DRAM: 1.500
CPU LLC: Ultra-High
CPU/NB LLC: High
CPU Over-Current: 130%
CPU/NB Over-Current: 120%
CPU Spread Spectrum: Off
CPU PWM Phase Control: Extreme (Mode: T.Probe)

Hardware in sig

If I go up 10MHz on Bus then no longer stable even if I go to 1.500v on vcore

If i go up to 22 on the multiplier then no longer stable even if I up the vcore again

Something else is limiting me and I can't find it, I have tried reducing HT, RAM and NB frequencies and trying for higher CPU clock speed but no luck, even if I go extreme at 1.550v vcore

Any suggestions?

Any point above the 4.6ghz mark (on average based on what ive seen) requires ALLOT more voltage so yeah i'd stay around the clock u are on, anything above 4.4 tbh is pretty respectable. Try getting a low voltage 4.6 if you can

dfour · 6 May 2013 at 11:11

try adding a little more voltage to the northbridge and the cpu/nb as well . Mine needed that to hit 5.1gig with 1.52vcore (didnt try priming it at that speed though stable through 3dmark13)