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Topic: Radeon released RX 480. (Card is Released) - page 17. (Read 60193 times)

hero member
Activity: 1008
Merit: 1000
It probably was a cost saving measure in manufacturing where this design would cut costs by some tiny amount and thats why you end up with a poor design.

Quote
The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

I think you could also add the memory they use is clocked at a high speed and most likely running inefficient, pulling more power.  So instead using a wider bus on the interface they speed up the traffic.  Fine but then it seems they looked for an additional corner to cut to save costs, its like they said oh lets use 6 pin to save that fraction of a penny in manufacturing and then pull the rest from the mobo.

The electrical engineering guys want to build things right to the proper specs but then you have these assholes that look for corners to cut to increase profit.
hero member
Activity: 722
Merit: 500
The 6 pin grounds are all grounded (one should be sensing, not grounded) on the reference rx480.  So in practice it can deliver the same power as the 8 pin.

The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

As such, when both the GPU and the full 8GB of ram are being pushed, it will overload the pci-e


This being a physical  circuitry problem, all the drivers can do is to throttle the card (decreasing performance). Or, if there is a margin, to throttle the gpu Voltage.

If the GPU  power is mainly supplied by the PCIE slots, then it is good news as we can under volt that.

The GPU is partially PCI-E. Its mostly 6pin

Even the partially PCIE, it has already killed so many mother boards. Most of the motherboards are quite old ones.

These motherboards will not have warranty left. So that is a big loss to the miners and lost time in mining.
hero member
Activity: 882
Merit: 500
CryptoTalk.Org - Get Paid for every Post!
The 6 pin grounds are all grounded (one should be sensing, not grounded) on the reference rx480.  So in practice it can deliver the same power as the 8 pin.

The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

As such, when both the GPU and the full 8GB of ram are being pushed, it will overload the pci-e


This being a physical  circuitry problem, all the drivers can do is to throttle the card (decreasing performance). Or, if there is a margin, to throttle the gpu Voltage.

If the GPU  power is mainly supplied by the PCIE slots, then it is good news as we can under volt that.

The GPU is partially PCI-E. Its mostly 6pin

Even the partially PCIE, it has already killed so many mother boards. Most of the motherboards are quite old ones.
hero member
Activity: 672
Merit: 500
Wow by reading all this, I feel lucky that I miss the boat buying rx 480. They were OOS really fast.
reference 480 is bad card for mining. i can't believe AMD failed it so much on so many points
hero member
Activity: 672
Merit: 500
If the GPU  power is mainly supplied by the PCIE slots, then it is good news as we can under volt that.
no you can't.
full member
Activity: 176
Merit: 100
The 6 pin grounds are all grounded (one should be sensing, not grounded) on the reference rx480.  So in practice it can deliver the same power as the 8 pin.

The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

As such, when both the GPU and the full 8GB of ram are being pushed, it will overload the pci-e


This being a physical  circuitry problem, all the drivers can do is to throttle the card (decreasing performance). Or, if there is a margin, to throttle the gpu Voltage.

If the GPU  power is mainly supplied by the PCIE slots, then it is good news as we can under volt that.

The GPU is partially PCI-E. Its mostly 6pin
hero member
Activity: 966
Merit: 501
Wow by reading all this, I feel lucky that I miss the boat buying rx 480. They were OOS really fast.
hero member
Activity: 532
Merit: 500
The 6 pin grounds are all grounded (one should be sensing, not grounded) on the reference rx480.  So in practice it can deliver the same power as the 8 pin.

The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

As such, when both the GPU and the full 8GB of ram are being pushed, it will overload the pci-e


This being a physical  circuitry problem, all the drivers can do is to throttle the card (decreasing performance). Or, if there is a margin, to throttle the gpu Voltage.

If the GPU  power is mainly supplied by the PCIE slots, then it is good news as we can under volt that.
full member
Activity: 176
Merit: 100
The 6 pin grounds are all grounded (one should be sensing, not grounded) on the reference rx480.  So in practice it can deliver the same power as the 8 pin.

The problem is two fold:

1- AMD soldered the RAM vrm's to pull its power exclusively from the pci-e, without touching the 6 pin.
2- AMD hard soldered two pci-e power lanes to the GPU.  So instead of the gpu pulling all its power from the 6 pin, its also pulling from pci-e.

As such, when both the GPU and the full 8GB of ram are being pushed, it will overload the pci-e


This being a physical  circuitry problem, all the drivers can do is to throttle the card (decreasing performance). Or, if there is a margin, to throttle the gpu Voltage.
full member
Activity: 191
Merit: 100
AMD comunicate to resolve the problem for more watt with upgrade .
The solution is additional power connections, either 8 pin or dual 6.

That is too late for the people who already bought the RX 480 cards. If you wait until the AIB out, there is not much to mine.
legendary
Activity: 1134
Merit: 1001
AMD comunicate to resolve the problem for more watt with upgrade .
legendary
Activity: 1901
Merit: 1024
Powered riser will solve 480x problem only if its TOP quality with connector which can provide 80W, and I can not answer which one will provide that!

Chines ones are not so good most you need to resolder +12V line better and ground to have better contact that can hold 80W
hero member
Activity: 867
Merit: 1000
I see the power issues with the rx 480. Does using a powered riser solve this problem?
full member
Activity: 236
Merit: 100
No the driver or bios can not balance power distribution, they can only limit TDP and in that way get the PCI-e slot keep in line with 75w

For 6 or 8 pin to draw more power they must redesign VRM on PCB, but most customs cards from MSI, ASUS, Powercolor will do it and prolly use 8pin connector, even if they use 6pin their VRM design might use more power from the 6/8pin connector

If that is the case, there will not be overclocking of the 480 any more. They might limit the memory frequency to be below 2200MHz.

And that would mean lower and slower hashrates, they really needed 512bit memory instead of the 256bit...

Compared to R9 390, which has 512 bit, RX 480 has only 256 bit memory bus, but the memory speed is faster.
hero member
Activity: 1008
Merit: 1000
No the driver or bios can not balance power distribution, they can only limit TDP and in that way get the PCI-e slot keep in line with 75w

For 6 or 8 pin to draw more power they must redesign VRM on PCB, but most customs cards from MSI, ASUS, Powercolor will do it and prolly use 8pin connector, even if they use 6pin their VRM design might use more power from the 6/8pin connector

If that is the case, there will not be overclocking of the 480 any more. They might limit the memory frequency to be below 2200MHz.

And that would mean lower and slower hashrates, they really needed 512bit memory instead of the 256bit...
hero member
Activity: 532
Merit: 500
No the driver or bios can not balance power distribution, they can only limit TDP and in that way get the PCI-e slot keep in line with 75w

For 6 or 8 pin to draw more power they must redesign VRM on PCB, but most customs cards from MSI, ASUS, Powercolor will do it and prolly use 8pin connector, even if they use 6pin their VRM design might use more power from the 6/8pin connector

If that is the case, there will not be overclocking of the 480 any more. They might limit the memory frequency to be below 2200MHz.

That could be case for the reference RX 480. Maybe the memory power is supplied by the PCIE slots.
member
Activity: 130
Merit: 10
Can anyone with the card test all other algos? Are the miners optimized yet?

Ethereum is the only profitable mining coin, so people will just use that for eth mining. That is the reason for all the tests in eth.

Keep in mind that not everyone is interested in eth mining. So has anyone noticed any benchmarks for other algos?
hero member
Activity: 532
Merit: 500
No the driver or bios can not balance power distribution, they can only limit TDP and in that way get the PCI-e slot keep in line with 75w

For 6 or 8 pin to draw more power they must redesign VRM on PCB, but most customs cards from MSI, ASUS, Powercolor will do it and prolly use 8pin connector, even if they use 6pin their VRM design might use more power from the 6/8pin connector

If that is the case, there will not be overclocking of the 480 any more. They might limit the memory frequency to be below 2200MHz.
legendary
Activity: 1901
Merit: 1024
No the driver or bios can not balance power distribution, they can only limit TDP and in that way get the PCI-e slot keep in line with 75w

For 6 or 8 pin to draw more power they must redesign VRM on PCB, but most customs cards from MSI, ASUS, Powercolor will do it and prolly use 8pin connector, even if they use 6pin their VRM design might use more power from the 6/8pin connector
member
Activity: 82
Merit: 10
Is it possible the pci power draw is an inherent flaw in the card design, or is it sure that it is not? Meaning, if revised drivers can't allocate more power to the reference card's 6 pin, then using an 8 pin for the newer non reference cards would actually do nothing?
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