I have also posted this on the Hyperion Forum and Amigans.net. So far with no answer. Sorry in advance but just looking for an answer

At the moment I have a Radeon 5450 and a Radeon 9250 PCI installed in my X1000. It works fine in OS4.1 but I can not get 3D acceleration in any linux distribution except the officiel Ubuntu Remix 12.04 from A-EON.

I have been offered a cheap used Radeon 6870 and I was wondering if anybody have any experience with two PCI-E gfxcards and Linux? I know it runs in OS4.1 (no native 3D) but how does it work in Linux?

Btw, I have a 650 Watt powersupply that should be enough for the 5450 and the 6870, or?

@JohnFante

I don't have an answer for the first question, maybe http://amigax1000.blogspot.nl/2014/02/a-eon-ubuntu-remix-on-x1000-part-1.html could help ?

650W should more then enough:
an 5450 + 6870 should on 100% load does not exceed 200Watt.

Last edited by bennymee on 17-Aug-2014 at 01:47 PM.

@bennymee

Quote:

bennymee wrote: @JohnFante I don't have an answer for the first question, maybe http://amigax1000.blogspot.nl/2014/02/a-eon-ubuntu-remix-on-x1000-part-1.html could help ? 650W should more then enough: an 5450 + 6870 should on 100% load does not exceed 200Watt.

That's incorrect.

The 5450 is a crippled card, so will have very low power requirements. Plug it into the slot and forget it.

The 6870 however is a beast. Documentation recommends a minimum 500W psu for systems built with a 6870. That's consumer-level advice though, so you can ignore that.

DO NOT TRY TO USE THIS CARD WITHOUT CONNECTING THE AUXILLIARY 6-PIN POWER CONNECTORS. It might even work for a while, but if it gets to peak usage it could try to draw way too much power though the motherboard.
Whilst 'general usage' is obviously a lot lower, peak usage can be >250W on this card (At least on the voltage tweak/overclock edition). source

What's important with a high end pcie graphics card is the max power available on the 12V rail* of your psu (this should be printed on the label of your psu), since your graphics cards will be drawing power from the 12V rail both through the pcie slot and through any auxilliary (6-pin or 8-pin) connectors.

The actual nominal power supply requirements for the 6870 card can be deduced to be 300W (150W slot power + 2 75W 6-pin connectors), however I have read (although found no facts/figures for reference) that many motherboards manufacturers provide PCIe 2.1 slots which don't comply with the part of the the PCIe spec which increases connector power supply to 150W (only 75W slot power in PCIe 2.0).

It would be good to hear confirmation from Amigakit/A-Eon whether the Nemo/Cyrus motherboards can provide 150W through the PCIe slot(s).
Also, if using two PCIe x16 cards simultaneously, can 150W be drawn from each slot simultaneously?

* Some psus have multiple 12V rails, and you have to balance power requirements across them (Personally I'd stick to one with a single rail, it makes life easier.)

_________________
Troll - n., A disenfranchised former potential customer who remains interested enough to stay informed and express critical opinions.
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@Boot_WB

I meant 200Watt for the Gfxcards only.

My 6870 was running fine on my Amigaone 460ex and 300Watt a few days. But the card was placed in my pc again because the housing of the Amigaone was to small.

Last edited by bennymee on 17-Aug-2014 at 09:06 PM.
Last edited by bennymee on 17-Aug-2014 at 09:05 PM.
Last edited by bennymee on 17-Aug-2014 at 09:04 PM.
Last edited by bennymee on 17-Aug-2014 at 09:03 PM.
Last edited by bennymee on 17-Aug-2014 at 09:03 PM.
Last edited by bennymee on 17-Aug-2014 at 09:01 PM.

@bennymee

Quote:

bennymee wrote: @Boot_WB I meant 200Watt for the Gfxcards only. My 6870 was running fine on my Amigaone 460ex and 300Watt a few days. But the card was placed in my pc again because the housing of the Amigaone was to small.

Using AmigaOS (ie 2D only) you're never going to exceed 200W for those two cards.

Under Linux, however, the card's 3D functions can be used which could take the power consumption above 200W (The link above gives 257W consumption for the 6870 under peak 3D usage) - better to be safe than sorry.

It recently took me a few days of reading, re-reading, and scouring the web for info to make sure I had the right setup for the 6870 (I ended up buying a £50 psu just for that card), and just wanted to save the OP the trouble of following the same path.

Last edited by Boot_WB on 18-Aug-2014 at 10:17 AM.

_________________
Troll - n., A disenfranchised former potential customer who remains interested enough to stay informed and express critical opinions.
opp., the vast majority who voted silently with their feet.