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Guru3D review of RX 480


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12 replies to this topic

#1
kirottu

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http://www.guru3d.co...b_review,1.html

 

TLDR: Good card for those who haven't upgraded a while.


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#2
teknoman2

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there were some issues reported by many reviewers that the card, while having a TDP of 150W could suck up to 230W in some cases, while others have found it to draw as low as 137W on full speed and OC.

AMD says the 8GB model should be at 130W and they are looking into it but some theorize that the problem is only present in review cards that have a switch that makes them work as both a 4GB and a 8GB model at will. that, along with a driver bug on the driver version the reviewers used, could fool the system into thinking there are 2 cards and it tried to squeeze another 130W through the PCIe... or at least as many W as the slot could manage to let through.

there was also a benchmark with crossfire in 15 games and in some games 2x480 marginally beat the 1080 while in most it was very close. the CF efficiency ranged from 50% to 93%



#3
ManifestedISO

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I think the article sets a new benchmark, 36 pages. Fortunately it's well-written. Better make a sandwich and get started ...  



#4
Humanoid

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It's not terribly exciting, yeah, which makes for a pretty simple summary:

 

a) If you have a 290/390/970/980 series card now, then go away, there's nothing to see here.

b) If you don't already have one of those cards, then essentially the cost of your upgrade to that tier has been reduced by about one-quarter to one-third.

 

 

Some more observations:

1) The reference cooler sucks. As always, wait for custom models.

2) Power consumption is disappointing. It's not a problem as such, cards have drawn over PCI-E spec before with no issue, but for a company who used to publish very conservative TDPs, they've now joined nVidia in using it as a marketing tool to look good on paper.

3) Performance is as expected, nothing less but also nothing more.

4) Overclocking headroom is nearly non-existent but it scales well with what little there is. This suggests a fair bit of room for improvement with the custom models.

5) It's observable that it does perform better with newer titles, so while performance today is barely over the 970/390, it really should creep up over the coming months (and years) to end up closer to the next tier I suspect.

6) It's freakishly good at running Hitman for some reason, pretty much matching a 980Ti. If the one and only game you play is Hitman I guess that's good news?



#5
teknoman2

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where the hell do they come up with these prices in this economy? the reference 480 8GB here is sold for around 350 euro... that's almost 400$. same card in france is sold for 265 euro. may as well order one from amazon.fr, even if i have to add a shipping fee it will still be cheaper



#6
Zoraptor

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480/ 8gig is NZD500 (USD 350) here. Ironically, you can now get a 390X for slightly less than that amount instead, when a few weeks ago it was very rare to see them for less than $700.



#7
Humanoid

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Cheapest here is $369AUD. Minus 10% tax and then converting to USD, that's just under $250. Considering the RRP of $239USD, that's actually very good, if only because the Aussie dollar is steadily dropping value.

 

On the other hand, I got my 290X which is roughly equivalent for $405AUD a year ago so the value proposition has mostly been wiped out by the currency movement and the clearance status of the 2xx series back then. The best time to buy a new video card recently was in late 2014 when 290s were being cleared out for pretty close to $200USD. Essentially what the RX 480 has done is just revert us back to that state in terms of price-performance, nearly two years on.

 

Looking at it like that, you could be forgiven for being disappointed at the new card, but then also bear in mind that the intervening time has been one of the worst ever times to buy a new card from a value perspective, so it's good to see a product get us out of that rut. Can't help but think that the RX 470 will be the pick of the Polaris litter though, the chip seems to respond very well to downclocking slightly.

 

 

P.S. There seems to be a lot of variance in the silicon lottery this time around, but fps gains seem almost directly proportional to clock speeds. Depending on the average clocks achieved by the custom boards (assuming they don't go wildly over the power limit by doing so), it's possible for the chip to jump a tier and reach Fury levels of performance.



#8
TrueNeutral

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Gonna get the 4GB variant when a custom cooler variant comes out, provided they don't mark it up significantly. Fits nicely in my budget.



#9
Humanoid

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I can't read German, but computerbase.de supposedly did a test where they manually reduced voltage to the card. Temperatures dropped, power use dropped by 30W ....and performance went UP because it was no longer hitting the thermal/power ceiling. Like a horse, Polaris out of the box is being whipped too hard and performance instead drops as a consequence.

 

AMD, why do you do this to yourselves?



#10
teknoman2

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i was reading something interesting on redit regarding the over 200W power consumption issue: passing more than 75W through PCIe is actually illegal. so i don't think AMD deliberately said 150W TDP, put a 6pin and said "let the other 130W pass through the PCIe and if it burns the motherboard who cares". no matter how big or small a company is, i don't think they would want to get sued and waste money in a courtroom.

hmm, considering the above post, i think the most probable reason for the power issues may actually be a bad implementation of clock boost. from what i know AMD never had a boost in their cards before so the one they made for the 480 may not be working right.


Edited by teknoman2, 30 June 2016 - 06:35 AM.


#11
Humanoid

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Um, it's out of spec, but hardly "illegal". It's happened before, though to lesser degrees, with both companies in the past. Nothing bad happened, no one went to court, no one was fined, and to my knowledge no hardware broke because of it. And that's just for out of the box products, overclockers regularly run their cards such that they consume power way beyond what their connectors are technically rated for. Heavily overclocked high-end cards that consume 400W of power while nominally rated for 300W, no problem in practice.

 

Also if those >200W reports are true then I suspect they're one-off faults with individual cards, the widespread issue is that they're drawing ~160-170W while technically the PCI-E slot and the 6-pin power connector are only rated to 75W each. Being officially rated to something has no real correlation to what the connector is actually able to deliver. I've read before that it's perfectly viable to draw 200W through a 6-pin connector, only above that you might start running into the risk of heat damage/melting.

 

So let's assume a worst case of 170W power draw, and it's taking 75W from the 6-pin connector, i.e. the excess over-spec power is all being drawn through the slot. That's 95W, so 20W over spec worst case. In reality it might just be drawing 80W from each. Sure, it's a little naughty and looks a bit unprofessional, but in the grand scheme of things inconsequential. The 750Ti and 950 are known to draw 5-10W over spec at times too.


Edited by Humanoid, 30 June 2016 - 06:30 AM.


#12
teknoman2

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maybe illegal is strong word but the holder of the PCIe trademark is obligated to take to court anyone who makes a PCIe hardware that draws more than 75W through the slot or they lose the trademark. so a hardware company is not allowed to make a PCIe product that draws more than 75W through the PCIe because of trademark infringement. 



#13
Bartimaeus

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For the record, and since it was mentioned here, the PCIE problem was partially fixed by a recent driver update. According to what I've read, it's still just a little out of specifications, but, as one person I read put it, "[...]probably out of the danger zone now."


Edited by Bartimaeus, 08 July 2016 - 01:19 AM.





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