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RX 480 overclock discussion - Page 12

post #111 of 433
Quote:
Originally Posted by comagnum View Post

I ran an 8300 with my 480 and didn't notice any bottlenecks. Try undervolting the card some, start with 1300/1100mv and memory @ 2200/1000mv and go from there. Increase power level to 20%


what motherboard and memory are you running?
post #112 of 433
Update: I got to 1340 Mhz @ 1100 mV but memory is not really stable (http://www.3dmark.com/spy/199576). At 2200 Mhz the memory error counter (hwinfo) starts to grow no matter what voltage i apply. Currently i am back to 2100 Mhz @ 990 mV and watch the error counter.

I collected some data from reviews for comparison with my card rx480ocdata.pdf 46k .pdf file .

Most likely i will stay at a high overclock but set a lower power target that gives me acceptable fan noise. On high load it will throttle a bit, but quite often i get maximum clocks. In Witcher 3 for example it throttles only in dense forests. I still have to decide whether +20% PT is acceptable or not. I probably will reduce it to +15% because i dont want to go above 2200 rpm for the fan.

Power target throttling seems to work much better than thermal throttling. As soon as i reach the thermal limit i get massive clock reductions.
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post #113 of 433
I just received my Sapphire RX 480 (reference) today. I have figured out Wattman and I have been tinkering with overclocking / undervolting.

I had no problems hitting 1340 and I could go higher but the card sounds like a leaf blower. lol

I have settled for the following:

Core: 1300mhz / 1.025v
Mem: 2200mhz / 1.000v
Temp: 85c Max / 75 Target
Fan: 2100 min / 3000 target

My build is newer but I do have Unigine Heaven installed. Running it on Ultra for 30 mins at this overclock the temps sat right at 80c, bouncing to 82c then right back to 80c. I did some heavy gaming for a few hours and the temps never really passed 64c.

I am newish to overclocking, especially GPUs and modifying voltages. How I am doing here? Any recommendations?
post #114 of 433
Quote:
Originally Posted by Techbyte View Post

I just received my Sapphire RX 480 (reference) today. I have figured out Wattman and I have been tinkering with overclocking / undervolting.

I had no problems hitting 1340 and I could go higher but the card sounds like a leaf blower. lol

I have settled for the following:

Core: 1300mhz / 1.025v
Mem: 2200mhz / 1.000v
Temp: 85c Max / 75 Target
Fan: 2100 min / 3000 target

My build is newer but I do have Unigine Heaven installed. Running it on Ultra for 30 mins at this overclock the temps sat right at 80c, bouncing to 82c then right back to 80c. I did some heavy gaming for a few hours and the temps never really passed 64c.

I am newish to overclocking, especially GPUs and modifying voltages. How I am doing here? Any recommendations?

Sounds like you're on the right track. If you don't want to change the cooler you could try upgrading the thermal paste to reduce temperatures a little bit...but ultimately temperatures and noise will be an issue with reference cooler unless you're willing to drop those clocks/volts and sacrifice some performance.

If you're willing to spend a couple bucks and exert a little effort, the Arctic Accelero Mono Plus or Twin Turbo would be a cost effective solution to drastically reduce noise and keep temperatures in check.

Water cooling is also an option with an AIO cooler and a bracket like the NZXT Kraken G10. This leaves the VRMs bare, and they will likely overheat under extended load causing instability. Scroll back a couple pages and you can find my setup with AIO cooler and homebrew VRM cooling.

If you're into water cooling then a couple companies have full cover blocks for the RX 480. Just installed my XSPC Blade the other night, haven't gotten to post results yet.
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post #115 of 433
Quote:
Originally Posted by Techbyte View Post

I have settled for the following:

Core: 1300mhz / 1.025v
Mem: 2200mhz / 1.000v
Temp: 85c Max / 75 Target
Fan: 2100 min / 3000 target

That voltage looks impressive. That would be below 1000 mV for stock 1266 Mhz. What's your ASIC quality?
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post #116 of 433
My previous 1370 was not stable. Am now at

Core: 1350mhz / 1.050v
Mem: 2100mhz / 1.000v
+50% power target and sometimes under load I get some clock drops but never below 1300 and not with every test. Heaven and BO3 didn't drop but a couple times 3D Mark did.
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post #117 of 433
I think the Stilt or someone mentioned early on that we don't have control over the memory voltage yet. The "memory" setting in Wattman appears to be voltage for the memory controller. GPU sensor temps change with the voltage setting, but overclocking of ram doesn't. The ram chips are the same ones used in the 1070 I think and are rated for 1.5 volts. My max memory overclock is 2215 and that doesn't change at 1150 or at my undervolt "memory" bottom of 972. undervolting the "memory" allows me to Keep my overclock and shed 2 or 3 degrees from my GPU core. It also seems to help my firestrike score by freeing more headroom.
post #118 of 433
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.
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post #119 of 433
interesting. I hadn't paid that much attention to the lower states other than to note that I couldn't trim as much off the low end as I could on the high end without instability on the up ramp starting a scene. I never bothered monitoring the process to see what voltage I was actually getting.
post #120 of 433
Quote:
Originally Posted by BromoL View Post

That voltage looks impressive. That would be below 1000 mV for stock 1266 Mhz. What's your ASIC quality?

That is what is funny. At 1300mhz / 1.025v with the memory at 2200mhz I have zero issues. I was able to run it at 1300mhz/1.000v but started seeing artifacts after 10 minutes or so of Unigine Heaven. I say funny because I see all these people saying that ASIC quality for the RX 480 is the opposite. Lower % is better. If that is the case then mine is just ****.

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