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RX 480 - Overclocking / Undervolting Advice Needed

post #1 of 49
Thread Starter 
Hello,

So I finally received my RX 480 today! I have been playing around with wattman and I pretty much have it figured out. I have been looking into overclocking / undervolting my RX 480. I have read / watched a few guides but I have a couple questions, mainly with the voltage.

Here are my default voltages:



GPU-Z:




Why are my default voltages lower than many others that I have seen? Many say decreasing by 0.075 is the norm. Do they mean decrease the default by 0.075 even when overclocking?
post #2 of 49
Thread Starter 
Ok,

I just let Unigine Heaven cycle for 15 mins at my overclock and it never dipped / throttled.

Here are my settings:

1300mhz Core
2200mhz Memory
1.025v on Core
1.000v on Memory

Fans set at 2100 min / 3000 target
Temps set at 85 max / 75 target

Temps sat at 80c, jumping back and forth from 80c to 82c. Power consumption sat at around 130w.

How am I doing?
Edited by Techbyte - 8/3/16 at 3:22pm
post #3 of 49
Just a note: The "memory" setting is for the memory controller not for the actual ram. The ram is rated at 1.5 volts... so I guess this should have been obvious. I think the Stilt mentioned early on that we don't currently have control over the ram voltage. I undervolt my "memory" to 972 and it works fine at 2215 the exact same overclock I get at 1150. when I change the memory voltage, my GPU temp changes, not my memory temp. As far as I can tell, EVERYONE should undervolt their memory controller to get more headroom on the overall power usage.

I run my GPU at 1031 currently. the 972 is 2 up from the bottom on my memory. I haven't finished finding the bottom on my GPU yet. My ASIC quality is something like 86 in GPUZ. Other people were more in the 1038 range on their undervolt. I don't know what average is. I test stability in firestrike Ultra loop.

edit: Heaven doesn't hit my gpu as hard as firestrike Ultra. I can hit a higher stable overclock for instance in heaven then I can in fireestike ultra. kinda like linpack avx versus prime95 for CPUs. But you're doing great on your GPU voltage. I'm not overclocking right now. I'm running stock as I'm having temp problems with my waterblock. I'm at 72 degrees for firestrike ultra and it goes to 81 in the loop. (bad problem with my ek full cover block)
Edited by greytoad - 8/4/16 at 11:41am
post #4 of 49
Thread Starter 
Thank you for the info. I have played with my overclock / undervolting more and I found that 1300/1.025v core and 2200/1.000v memory is my best bet. I did try lowering my memory voltage further and it appeared to work fine but I had millions of GPU memory errors showing in Hwinfo64. At 1.000v I get 0 errors. I can push the core quite a bit further, as I had it stable at 1350mhz already but it sounded like a leaf blower. Not worth it to me for 50mhz.

I think my RX 480 had kind of a crappy paste job too. I reapplied new thermal paste using Gelid Extreme. My peak load temps went down to 78c from 82c which is pretty normal in my experience. However, my idle temps went down about 10c. My central air is on today at the same settings it is everyday. My higher idle temps were the whole reason I even bothered redoing the thermal paste.

I'm really happy with my RX 480. It's performance and features are perfect for my setup. I have a LG 29UM68 2560x1080 IPS 5ms 75hz FreeSync display. The FreeSync range is 40hz-75hz. I set my frame rate target / limit to 75fps. I have yet to see the temps go beyond 64c while gaming, but I also haven't tried out all of my games.

Here is some info on my GPU / Runs.

GpuZ
post #5 of 49
I guess you're right about the memory errors. I"m passing the frame rate stability test for Firestrike Ultra loop, but I'm getting about a 6000 mem errors over the course of the endurance test. I get better Firestrike scores with the lower power usage on the mem controller, but maybe the errors also slow me down? I don't know much about this topic. I'll try raising my mem voltage to see where errors stop. Thanks. That's quite the undervolt you have there. I'll play with it more tomorrow. I'm undervolting because I"m getting terrible temps on my waterblock. I have Alphacool fittings on my EKWB full cover block. EKWB fittings are about 1.5mm shorter in the g1/4 thread compared to the alphacool fittings. (Eyeballing it.) That could be blocking some of the water flow on the inlet/outlet. I"m replacing those tomorrow and maybe I'll be able to overclock finally.
post #6 of 49
I did some testing. Interestingly, I get very few memory errors in the firestrike ultra endurance loop, but millions in the actual benchmark. When I add them to RTSS they seem to occur during the Physics test when the GPU down clocks. Somehow the GPU memory controller voltage is tied to the GPU voltage on the lower clocks. Maybe they are proportional in some way?
post #7 of 49
Memory errors are most likely not caused by controller voltage. Actual memory voltage (1.5xx V) is fixed. I get errors above 2100 Mhz no matter what voltage i set. At 2150 Mhz there are infrequent single errors. At 2200 Mhz i get infrequent large batches (thousands). At 2250 Mhz visible corruption starts. So 2100 Mhz is the maximum the given memory voltage allows for me. Reducing memory controller voltage reduced GPU power draw but becomes unstable at some point (for me not by image corruption, but by driver crashes).

My observation is that GPU core voltage is limited from below by memory controller voltage. Furmark downclocks for example to 900 Mhz but core voltage stays at 975 mV while the p-state for 910 Mhz has 824 mV set. Thats in the manual mode.
Edited by BromoL - 8/5/16 at 2:38am
i5 3470 + RX 480
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5-3470 Gigabyte H77-DS3H AMD Radeon RX 480 2 x 4GB Corsair Vengeance LP DDR3-1600 
Hard DriveHard DriveCoolingOS
128GB Samsung 830 SSD 240GB OCZ Trion 150 SSD Thermalright HR-02 Macho Rev. A (BW) Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2713HM generic Thermaltake Munic 430W Antec Three Hundred 
Mouse
Roccat Kone Pure Military 
  hide details  
Reply
i5 3470 + RX 480
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5-3470 Gigabyte H77-DS3H AMD Radeon RX 480 2 x 4GB Corsair Vengeance LP DDR3-1600 
Hard DriveHard DriveCoolingOS
128GB Samsung 830 SSD 240GB OCZ Trion 150 SSD Thermalright HR-02 Macho Rev. A (BW) Windows 10 Pro 
MonitorKeyboardPowerCase
Dell U2713HM generic Thermaltake Munic 430W Antec Three Hundred 
Mouse
Roccat Kone Pure Military 
  hide details  
Reply
post #8 of 49
Almost all of the errors occur when during the start or ramp from 300 to 1266 and the errors are an order of magnitude less when I set all p states to 1266 settings. (I can't change the idle p state without a bios mod.)
post #9 of 49
Quote:
Originally Posted by Techbyte View Post

Hello,

So I finally received my RX 480 today! I have been playing around with wattman and I pretty much have it figured out. I have been looking into overclocking / undervolting my RX 480. I have read / watched a few guides but I have a couple questions, mainly with the voltage.

Here are my default voltages:



GPU-Z:

Why are my default voltages lower than many others that I have seen? Many say decreasing by 0.075 is the norm. Do they mean decrease the default by 0.075 even when overclocking?

WOw asic 93%, that chip is golden. Also the reason why your stock voltage is so low.
Edited by Performer81 - 8/5/16 at 6:03am
post #10 of 49
Thread Starter 
Quote:
Originally Posted by Performer81 View Post

WOw asic 93%, that chip is golden. Also the reason why your stock voltage is so low.

I know right? I'm very lucky! Not just because of the ASIC quality of my RX 480, but also the fact that I got it for free. I won my RX 480 directly from AMD on Twitter. That is also why I am thinking of going to liquid cooling. The $100 price tag on the EKWB is much more justifiable when you consider I got the GPU it will be going on for free.
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