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Old October 1, 2012, 11:59 AM
great_big_abyss's Avatar
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Default Overclocking AMD APU - FM1

I hear that AMD's APU's won't overclock very well if you have AHCI enabled under the sata ports. Anyone know anything more about this?

I would like to overclock the 3670K i'm putting in my son's rig, but I'd also like to run an SSD, so having TRIM enabled under AHCI would be really nice!

Edit: After a little bit of research, it seems that if you push the BCLK over 110 and your SATA port is set to AHCI, it drops the attached drive.

Since I have a BE unit, I'll try leaving the bus where it is, and just increase the multiplier.

HTPC: Z77A-G45; 3770K; Zalman FX70; 2x4GB Kingston HyperX 1600Mhz; MSI GTX960; 2x 128GB Crucial M4 SSD; 4TB WD Red, 2x 2TB WD Green; Corsair RM650I; Corsair Carbide 600C;
Son's Rig: M5A97; FX8350; CNPS20LQ; 2x4GB Corsair Vengeance 1600Mhz; Powercolor 7950; 250GB Crucial MX200; 320GB WD Black HDD; SPI 700W; Bitfenix Shinobi;

Last edited by great_big_abyss; October 1, 2012 at 12:38 PM.
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Old October 1, 2012, 04:33 PM
MARSTG's Avatar
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or just use a Crucial M4
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Old October 1, 2012, 04:58 PM
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Yes, there are several oddities about overclocking the FM1 boards. They are great budget rigs but a couple of things to help avoid some frustration. As you said, AHCI mode is not good for overclocking the BCLK, it will 'lose' the drive after about 110-115 depending on the drive itself. Second, if you are using the onboard (APU) portion of the chip you cannot use the analog (D-sub) output or you won't get much higher than 125 (oddly, all the FM1 boards I've used don't allow you to use a Dsub>DVI adapater because of the pin arrangement). Lastly, and the oddest, if you want to get the maximum clock go as high as you can and then start raising the clock one at time. If the highest you can achieve is, for example, 150 you will find that 151 will fail, and 152, but 153 will work (just as example, each board is different in my experience). It seems to have dead holes in the reference clock that won't work but others that will and stable too, but I have found that to happen pretty high up the ladder, between 150 and 175.

Or you could just use the multiplier only :)
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