AMD APU Owners Club - Page 31

RetroFreud,

Hello, re-post

My Build;

3870K APU
ASUS F1 A75 V EVO (bios revision 1802)
8Gb Corsair Vengeance 1866 - CMZ8GX3M2A1866C9B
Corsair Force GT 120Gb SATA 3
Antec TruePower 650
Coolermaster Hyper 212 Evo

My overclocking has resulted in me settling for 3.6Ghz & 800Mhz GPU, at such frequency I experience no problems. I have driven the PC hard in 8hr+ sessions on BF3 at which point my highest recorded temp was 61*C on such a load. (1600 x 1200 on Medium Settings)

I am really happy with the ASUS F1 A75 V EVO Motherboard, will definitely buy ASUS again - a truly masterful BIOS. I do feel that I can get more out of my APU however my Coolermaster Hyper 212 currently blocks one of the Blue RAM seats so I'm using the two White RAM seats. It's advisable to use ASUS's Blue RAM seats for any overclocking purposes, but I'm doing alright on the white for now.

I have reached 3.8Ghz per core and Windows 7 booted but didn't offer any stability, reliability testing was impacted and BF3 crashed when I was running at 3.8Ghz per core after an hour or so.
I have since scaled back to 3.6Ghz and the PC is happy with this.

I noticed that above 3.3Ghz you need to begin work on the key voltages to maintain stability above the x33 multiplier. As a guide I'm using;

Core Voltage 1.437V
VDDNB 1.175V
DRAM V 1.500V
SB1.1V 1.150V
1.1VSB 1.100V
APU1.2V 1.250V
VDDA 2.500V

Overall I'm very happy with Llano - now 900Mhz on the GPU and 3.6Ghz on the cores. Validation to follow, thanks.

WumpusRX,

Hi buddy, just wished to confirm that I also had issues like yourself with movement on the base clock and RAM overclocking.
I'm on 1866 from Corsair, whilst I believe the RAM will overclock safely I haven't found any timings to suit it yet.

Looked at dropping to 1333Mhz via;

114Mhz x 34 Multiplier = 3.876Ghz per core

Can't get the RAM timings working effectively so looks like I'll have to stick with 3.6Ghz from 100Mhz base clock and x36 Multiplier.

regards,

Could I use these numbers into my first try of over clocking my APU or is there more to it then that type of board etc.. I rather try something that already works then go in complete cold turkey with ocing. I tried to find the spoiler tab and I failed still new here sorry.

Each system is diffferent, so your should probably do your own testing to get the best results. Its not that difficult, and theres enough info on the web and help here to figure out any issues you may come across.

Above couldn't get past 3.3 @1.4.

I can go 3.6 @ just over 1.4 (load readings go slightly higher then my bios settings, so no real solid number. Hardest test is IBT on the cpu/power area.

Wump, are you acounting for the increase in ram speed when you up the baseclock? Also, the nb is cause of instability when going up in baseclock as well, but keeps getting overlooked/forgotten. Drop that to an easy number when doing ram ocing to keep them seperate. Corrected nb should be below 900 for testing of other things, then go over to find the nb limit. My bios did not correct the nb frequency when i upped my baseclock, I had to do the math myself.

I don't think the northbridge frequency is really an issue with the APU's. I use a bclk of 140 and the NB remained stable at 900+ without even touching the voltage. That said, my motherboard doesn't even have the option to manually adjust the NB frequency, just the voltage.

mine definitely hit a point where it was causing 3dmark11 instability issues. Could also be the memory speeds i was hitting making the nb not like the frequency much. I maxxed out my baseclock to get the mem to 137 x 9.33 x 2 = 2556mhz, so theres a chance that the 2400+ memory wasn't nice on the northbridge/mem controller/whatever else is tied to the nb frequency.

EDIT: my asrock board let me pick nb frequencies, but the max was always tied to the ram settings(multiplier). 1866 allowed the nb to get a 900 setting, 1600 maxxed out at 800, and 1366 wouldn't go above 720, even though defaults always went lower then those. 1866/1600 would automatically select 720nb, at 1.2v/1.1125v, and the 1333 would pick 640? not really sure, never needed to use that setting.

Yeroon
Edited by Yeroon - 8/28/12 at 11:38am

Not sure why, but mine wouldn't play nice with anything beyond 1920MHz on the memory. It would pass all stability tests at ~2000MHz, but as soon as I loaded something 3D it gave me a CTD so I settled for 1866MHz.