Originally Posted by Alex132 Warning: Spoiler! (Click to show)
Originally Posted by Defoler
I would like to see a graph of that. Personally in the past I killed 2 motherboard for drawing too much out of the ATX socket (no extra power connections for PCIE on them). They were not cheap, but just not exactly for what they were planned to do.
Prepare to not be amazed!
Only around 30-40w on the PCIE Slot stock. And around 222w per 8pin connector stock.
IIRC they only powered the pumps and the fan from the PCIE slot. Everything else went through the PCIE connectors.
Interesting that when this GPU came out they had a list of recommended PSUs and stated that you should never use those split 8pin connectors.
I was just looking for that. Here it is:
Originally Posted by PsyM4n Warning: Spoiler! (Click to show)
What can I do about this?
Before grabbing and putting one of those cards in your system it's very important to be aware of the following:The R9 295x2 does not confront to the PCI Express 3.0 power delivery specifications.
According to the Peripheral Component Interconnect Special Interest Group
the said specifications specify a power draw of 150 watts from each 8-pin PCIe power connector, 75 watts from each 6-pin PCIe power connector and 75 watts from the PCIe slot.
The R9 295x2 is powered from two 8-pin PCIe power connectors and the PCIe slot. The maximum specified power draw from these adds up to 375 watts
. According to AMD, the R9 295x2 can draw up to 500 watts
on some typical scenarios and can even peak to about 600 watts
For validation and more information on the related specifications you can visit the PCI-SIG website (http://www.pcisig.com/
-What does this mean for me?
It means that the R9 295x2 can overload the cables on your power supply
, resulting in cables melting
and a possible fire hazard
AMD is fully aware of this situation and plans to setup a list of compatible power supplies
. Whenever the list becomes available AMD plans to put it on the following web address:
Some of the R9 295x2 reviewers were also informed about the situation with the following note:
The best things you can do are to consult the power supply compatibility list
AMD has (whenever it becomes available) and to specifically ask your power supply maker to tell you if the power supply is compatible
with the R9 295x2.
Spread the word and inform yourself and the ones affected. It's better to spend some time with customer support than to kill hardware that costs thousands!
Be reasonable people.
All in all the issue here is that while the R9 295X2 didn't exceed the PCIe slot spec and when it came to the 8-pin connectors it made clear what its requirements were, at the end of the day it wasn't a PCIe compliant device and therefore not included on the Systems Integrator List because of this, so people knew what they were getting into.
The RX 480 is a mainstream card that is likely to go into many OEM systems, the implications are completely different.
I'd like to ask the people who are trying to downplay the issue if they'd be fine if a GTX 750 Ti without a power connector would pull 90w from the slot instead of its rated 60w. All of that talk about the card being great to upgrade crappy OEM systems with an otherwise decent Intel CPU but only integrated graphics would go down the drain. Nobody would recommend people risk damaging the system with an out of spec card. The 750 Ti is such a great card because it does what it says.
And again, the reference GTX 970 comes with two six pin power connectors and has a 145w max board power. The RX 480 has a 150w rating and only has one. AMD was even boasting about it (see below). Considering the measurements made by the majority of sites, not even counting the ones that specifically measured the PCIe slot demands, it seems pretty clear that the card uses more than 150w very frequently. It's inadequate and misleading to think it's a 150w card.