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RBE / 5770 fan speed question


New Member
Nov 8, 2019
1 (0.11/day)
tl;dr: Why might 5770 fan speed be controllable with MSI Afterburner, but not with RBE Fan Settings adjustments?

I pulled an ATI Radeon HD 5770 out of an old Dell for use in a project where I don't need high-performance gaming, but do need to be able to drive three monitors.

It worked for this purpose once I used RBE to bump the UVD RAM speed up to 1200 MHz to stop the second and third monitors from glitching when the card went in and out of UVD, thanks to tips I read here and elsewhere online.

Because the old fan was very noisy and cleaning/repasting didn't help, I replaced the stock cooler with an Arctic Accelero LS Plus.

It's fairly quiet now, but for the purposes of my project, I'd like to make it quieter.

I've tried both transfer function and look-up table adjustments in RBE, but they have little or no effect--the fan just keeps running around 45% speed with the GPU at 45 C.

MSI Afterburner is able to control the fan speed, so there doesn't seem to be anything wrong with the card or cooler.

I'm running the Crimson drivers/software package, and Global Overdrive is not activated.

I wonder if a driver is stepping on my RBE fan tweaks, but I'm no expert in this area.

Both because I'm enjoying geeking out on this and because I'd like to solve this without having to run additional software...does anyone know why the 5770 might not respect RBE fan adjustments, or how I might overcome it?

Thanks for any help!
Feb 3, 2019
488 (1.70/day)
Chicago Land
Processor 2700X @ x4 4400Mhz
Motherboard Asus B450-I Gaming
Cooling Stock Air
Memory Corsair 3000nhz 13-15-15-15-32-53 2T
Video Card(s) Asus strix GTX 980 OC
Storage SSD
Display(s) 21" - 55"
Case None
Power Supply Antec CP series 850w
Mouse Razar Mamba Tournament Edition
Keyboard Logitech G910
Software W7
Benchmark Scores Max Cpu clock 7685Mhz FX-8300 WPrime 32m 2.886 seconds AMD 2700x
I wonder if its that the PWM fan is different from the original. Is my first guess. Not sure, would have to test with original fan.

Nice job modding though!!