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RX 480 overclock discussion - Page 13

post #121 of 433
Quote:
Originally Posted by BromoL View Post

I would like to add, that GPU core voltage never drops below memory voltage. So the voltage values in the lower p-states are kind of pointless. The chip never runs in these states without the memory also in its performance state. So you always get at least your memory voltage applied to these p-states.

Testing my undervolt I found that I get memory errors when the card clocks down. It's fine in Firestrike Ultra loop because it never clocks down. But in the Physics test where it clocks down It's throwing up millions of memory errors. Perhaps there is some additional proportionality on the ramp down with the GPU memory clock controller setting.

edit: I'm going to set all my Pstates to 1266 settings and 1266 speeds and see if the memory errors persist.
Edited by greytoad - 8/4/16 at 6:38pm
post #122 of 433
That seems to be it. with 1266 settings across the board, my memory undervolt gives thousands of errors in firestrike not millions. The "memory" voltage setting must be an offset for another table we don't have access to or something. ideas? Maybe this should be a question in the BIOS moding section ?
post #123 of 433
So I've read a few pages and jump to no conclusion, anyone lucky in overclocking no-reference cards past 1420Mhz? Which tool are you using to change vgpu to 1.25V and where to download it, if it'ss the Stilt one..
post #124 of 433
Quote:
Originally Posted by greytoad View Post

That seems to be it. with 1266 settings across the board, my memory undervolt gives thousands of errors in firestrike not millions. The "memory" voltage setting must be an offset for another table we don't have access to or something. ideas? Maybe this should be a question in the BIOS moding section ?

For me, memory errors correlate with memory frequency. Above 2100 Mhz i get errors no matter what controller voltage i apply. For higher frequencies i probably need more actual memory voltage which is not accessible so far. Lowering the memory controller voltage only gives me instability. Memory errors at 2200 Mhz never resulted in visible artifacts for me but i am feeling better without them. If future drivers keep the 2050 Mhz limit on memory this is a moot point for me. I wont overclock outside of wattman.

Undervolting the memory controller definitely allows the core to use more power and allows higher clocks at low power targets. I played two hours ROTTR with 1300Mhz@1075mV GPU and 2100Mhz@975mV MEM at only +5% PT and 2000 rpm on the reference cooler and got averages of 1264Mhz, 114W and 83°C. In Witcher 3 these settings dont throttle at all. ROTTR has very consistent load, while Witcher 3 produces only little load in interiors (like 90W at 1300 Mhz) and only approaches the power limit in forests with dense vegetation.
Edited by BromoL - 8/5/16 at 12:36am
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post #125 of 433
Both could be true too. I'll lower my overclock. maybe the hidden ram voltage is what's ramping with the gpu voltage. I'll do more testing later. I have to change out my fittings on my rig today. I'll get to it tonight.
post #126 of 433
I found my best option for gaming is Core 1300mhz @ 1.025v / Memory 2250mhz @ 1.025v. These voltages are just about as low as I can go before I start getting artifacts. I can go quite a bit higher with clocks but the card sounds like a leaf blower and with the reference cooler I'd rather not anyways. My temps top out at 82c with the above settings.

Also, what is up with the memory voltage controls in wattman? When I set my core clock / voltage and my memory clock / leaving memory voltage on auto my core voltages are all over the place. It appears I have to match my memory voltage to my core voltage. Is that what people were referring to with the wattman settings for memory voltage actually only controlling the voltage to the memory controller?
post #127 of 433
Just got a XFX non reference last night. Didnt get much chance to change too much but i threw it onto 1400 core and 1050 mem with no voltage changes.
Played witcher 3 for about 2 hours with no issues. will try to push past 1420 and let you know
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post #128 of 433
Which edition did you get? What's the voltage? Just curious. 1400 is pretty high for this card on stock reference voltage. Down right impossible with the reference card even with max voltage and fan on high my reference only did 1380 3dmark stress loop stable at 1150mv. I run 1233mv for 1435 on water. I know it's been a while since you posted. I'm just wondering. I was looking at buying a 2nd 480. the Black edition XFS card for 300 on newegg is supposed to be compatible with the ek reference block but comes with a 8pin. is that the one? I'm considering it for a 2nd card and was wondering if the chip is binned. What's the asic on yours? voltage necessary for overclocking is holding me back more than cooling.

edit: nm. it's not compatible with ek block. but still interested in question, just not as much.
Edited by greytoad - 8/21/16 at 9:39pm
post #129 of 433
Heres the link to the product page, i havent seen any reviews on it but its the cheapest non reference i could find in Australia.
http://www.xfxforce.com/en-us/products/amd-radeon-rx-400-series/rx-480-gtr-black-8gb-dd-led-rx-480p8dba6

originally it was on 1175mv but ive had it on 1150mv for about a day and half now with no issues.
Fans are set min 1330 howver they turn off under 50c i havent found a way to ovveride this. max 3800
with the target temp set to 70 its virtually inaudible compared to my old windforce 7950
power limit is +50%
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post #130 of 433
that voltage makes sense. Only pretty good asics can run 1400 at 1150. Thanks. Nice card.
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