AMD Athlon 760k goes into "limp mode" in two cores after 4.6GHz

MrGuy04

Commendable
Jun 29, 2016
3
0
1,510
I decided I needed a little increase in performance, so I decided I'd try to overclock my new(ish) 760k. It's been going good up to 4.6GHz, and seeing around 20CB in Cinebench for everu .2GHz. However, 4.7 or 4.8 I finally needed to increase my voltage a little, and it stopped crashing instantly. However, it went from 350CB to 200CB every run. So I did some googling and was pointed to download AMD Overdrive. I saw that cores 0 and 1 were hitting my x48 multiplier but cores 2 and 3 were in a "limp mode" where they were same temp, voltage, but the multiplier was 1.8 as such, the cores refused to go past 1.8ghz. I was told by another thread to just add some more voltage, so I did, but didn't work.

Specs:
AMD Athlon 760k at 4.4GHz base, 4.6-4.8GHz max turbo (Overclocked)
CoolerMaster Masterliquid 120
Custom mosfet and choke heatsinks
Gigabyte GA-F2A88XM-DH3 Rev 3.0 Bios version F9
DiyPC Silence-BK with 2x 120mm front, 1x 120 rear, Masterliquid 120 @ rear.
8GB DDR3 Kingston HyperX 1866mhz in slot labeled "Slot 1" on MB, shows up as "Slot 3" in software, and is slot farthest from CPU
EVGA Geforce GTX 950 SSC 2GB
1TB WesternDigital Black drive
CoolerMaster Masterwatt 750

Have confirmed 8 pin PSU CPU power cable is plugged into 8 pin CPU Power connector. other threads mentioned this.


 
Solution

jacobweaver800

Respectable
Dec 15, 2017
1,539
0
2,460


I believe those cores went into "Limp mode" because they were either running too hot to keep that voltage and multiplier or they were just not good enough to handle it, try bumping down the clock speed to as high as you can get it without those cores going into limp mode. Also, try lowering the voltages to help with temps.
 

MrGuy04

Commendable
Jun 29, 2016
3
0
1,510


I've been playing with voltages and clock speeds. It does not seem to be getting too hot. I've been monitoring with Overdrive and they stay cool. Up until 4.7ghz no additional voltage was necessary. I guess I've hit the limit on this processor.

 

jacobweaver800

Respectable
Dec 15, 2017
1,539
0
2,460


That doesn't surprise me. 4.7 is a really good clock speed for not having to add voltage. You got a good chip if you can overclock that far without additional voltages. My concern is maybe those cores that were "limping" may have a defect on the chip's die causing them to limp when hitting those speeds. Just run it at 4.7
 
Solution