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DPete27
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Flash your RX480 to an RX580

Wed Apr 19, 2017 4:38 pm

Just saw this article at Tech Power Up where one of their readers successfully flashed his RX480 to an RX580 BIOS to achieve 1411MHz. Interested?
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Re: Flash your RX480 to an RX580

Wed Apr 19, 2017 4:49 pm

Brings back the fond memories of the ATI 9500 -> 9700...although the performance increase there was quite a bit more.
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Chrispy_
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Re: Flash your RX480 to an RX580

Wed Apr 19, 2017 5:43 pm

Not particularly interested, I'm afraid.

The RX580 gobbles down 35W more power for a paltry 3% performance boost. It would appear that the 480 is overvolted to the point of throttling under full load without increased power targets, and the RX580 makes this worse. You're much better off spending ten minutes playing with the voltages in Wattman to see how low you can go, since an undervolted 480 or 580 will spend more time at it's max boost clock.

If the default voltage is 1160mv at 1266MHz and you can get all the way down to, say 1025mv before it locks up and resets the driver, then you can probably run 1333MHz at 1100mv or something because there is so much power budget released by reducing the voltage.
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DPete27
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Re: Flash your RX480 to an RX580

Thu Apr 20, 2017 9:08 am

My experience in undervolting would agree, but I wanted to point this out for the Xtreme gerbils out there. Sounds like the BIOS flash allows you to add more voltage than the RX480 BIOS would, hence allowing you to hit higher clocks. Looks like it took 1225mV to hit 1411MHz.
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Re: Flash your RX480 to an RX580

Thu Apr 20, 2017 9:55 am

Chrispy_ wrote:
Not particularly interested, I'm afraid.

The RX580 gobbles down 35W more power for a paltry 3% performance boost. It would appear that the 480 is overvolted to the point of throttling under full load without increased power targets, and the RX580 makes this worse. You're much better off spending ten minutes playing with the voltages in Wattman to see how low you can go, since an undervolted 480 or 580 will spend more time at it's max boost clock.

If the default voltage is 1160mv at 1266MHz and you can get all the way down to, say 1025mv before it locks up and resets the driver, then you can probably run 1333MHz at 1100mv or something because there is so much power budget released by reducing the voltage.


Hmmm... the RX 580 was attractive to me but I wasn't looking at it this way. Then again, either way I'd be looking at pre-oc'ed non-reference cards e.g. Strix, Gaming X, so does that nullify 480s "advantage"?
 
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Re: Flash your RX480 to an RX580

Thu Apr 20, 2017 10:12 am

Flash your RX480 to a brick
 
DPete27
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Re: Flash your RX480 to an RX580

Thu Apr 20, 2017 11:28 am

TwistedKestrel wrote:
so does that nullify 480s "advantage"?

Probably off topic for this thread. However, the RX580 can likely be undervolted also, although it's clocks are likely pushed far past the efficient range of the frequency/voltage curve. The RX580 really isn't anything more than an OC'd RX480 but you might get higher clocks with slightly less voltage due to process improvements. As I mentioned, it looks like the RX480 in the TPU article needs 1.225V to hit 1411MHz. The Powercolor RX580 in anandtech's review needed 1.205V to hit 1380MHz but that's without voltage tweaking. I'd bet you could run 1400MHz on an RX580 at less than 1.2V by, as Chrispy put it nicely, "spending ten minutes playing with the voltages in Wattman". My RX480 does 1305MHz happily at 1.03V FWIW. Keep in mind you're playing the silicon lottery in all cases, so YMMV.

I'd recommend taking pricing into consideration for your decision. I've seen higher end 8GB RX480s (better than this one) for $190 or less (after MIR) and they're "old news" now that the RX580 has launched, so the RX480 may see further discounts to clear stock. Keep that in mind when you're looking at RX580 pricing and the ~5% performance improvement associated with it.

PS, before the RX580 launch I lobbied TR to do some investigation into the RX480 vs RX580 frequency/voltage relationships using manual voltage adjustments. That's still something that nobody else has really exclusively covered and it would've given TR quite a bit of publicity. Instead, we have to go elsewhere to see the important aspects of this launch. /vent
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Re: Flash your RX480 to an RX580

Sat Apr 22, 2017 1:21 pm

DPete27 wrote:
TwistedKestrel wrote:
so does that nullify 480s "advantage"?

PS, before the RX580 launch I lobbied TR to do some investigation into the RX480 vs RX580 frequency/voltage relationships using manual voltage adjustments. That's still something that nobody else has really exclusively covered and it would've given TR quite a bit of publicity. Instead, we have to go elsewhere to see the important aspects of this launch. /vent


Interesting proposition, but for this test to have any merit there would have to be a sample of cards (N=5? 10?) so that variances can be estimated. Picking, by chance, a golden 480 and a bad 580 would lead to confusing conclusions, for example. Unless, of course, you think that the 580 is really, really markedly superior (apples vs oranges).

Intuitively, I don't think there has been major improvement in silicon and the difference, if any, will probably small, hence the need for several cards. No web site has money for this kind of review, but I guess readers could probably derive a very decent estimate of the RX480 volt/freq curve, if we agree (all of us owners of 480/580) to follow a specific protocol.
 
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Re: Flash your RX480 to an RX580

Sat Apr 22, 2017 2:57 pm

Chrispy_ wrote:
If the default voltage is 1160mv at 1266MHz and you can get all the way down to, say 1025mv before it locks up and resets the driver, then you can probably run 1333MHz at 1100mv or something because there is so much power budget released by reducing the voltage.

Managed 1344MHz @ 1.105 mV on my XFX RS RX 480.

Turns out though XFX fitted their RS RX 480 cards with crummy VRM components (similar to a certain PowerColor RX 480) so it's likely why I'm not able to overclock past 1.175 mV or 1350 MHz without heavy throttling, and locked out from exceeding 20% power limit. The VRM section on this XFX card is cooled by the main heatsink so heat from the VRM plus GPU causes the fans to ramp up quick.

Flashing the Sapphire RX 580 BIOS removes those restrictions but how long will the VRM section survive those spikes to 250 or above watts? Anyways been messing around with the Sapphire 580 BIOS, and I can go up to 1400 MHz at 1.190 mV. A few of the Performance States don't match up with XFX card so I've been using WattTool to re-adjust.

I'd really have to mess up to brick this card btw since it has the bios switch feature.
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Chrispy_
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Re: Flash your RX480 to an RX580

Mon Apr 24, 2017 7:50 am

The RS series are the low-cost, slower-clocked variants, right? If you want serious overclocking that'll be XFX's GRT or XXX lines.
Does it have an 8-pin or a 6-pin connector?

I doubt they specced the VRMs any higher than necessary if it only has a single 6-pin connector and 150W power target for the whole board. I'm sure most boards and PSUs can handle >75W from both board and 6-pin, but I wouldn't want to push it too far.
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DPete27
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Re: Flash your RX480 to an RX580

Mon Apr 24, 2017 12:07 pm

biffzinker wrote:
been messing around with the Sapphire 580 BIOS [on my XFX card], and I can go up to 1400 MHz at 1.190 mV.

Interesting!! I hadn't thought of using the Sapphire BIOS on other manufacturers' cards. Pretty good freq/voltage you've got also. Thanks.

Chrispy_ wrote:
Does [XFX RX480 RS] have an 8-pin or a 6-pin connector?

8 pin. IIRC, only the reference blowers had 6-pin connectors since the whole debacle that created.
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DrDominodog51
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Re: Flash your RX480 to an RX580

Mon Apr 24, 2017 10:28 pm

Fair warning: the VRMs on RX580s are far better than their 480 counterparts.

The VRM on the XFX RS 480 was one of the worst 480 VRMs. Don't raise the power limit while it is using a 580 BIOS.

Flashing the Sapphire RX 580 BIOS removes those restrictions but how long will the VRM section survive those spikes to 250 or above watts?


It won't last long. I would advise against running any sort of power virus stress tester with the 580 BIOS as well.
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