joshv06 (OP)
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December 25, 2013, 06:28:37 PM |
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I cannot get 4 cards working with 1x risers or 4 cards working at all for that matter. I have never POSTed with 4 cards plugged in. Specs: GIGABYTE GA-990FXA-UD5 AMD AM3+ 990FX Motherboard R9 290 Video Cards Enermax Revo 1500W PSU 8GB Ram Works when: 3 cards plugged directly work 1 card with PCI-E 1x riser in 1x port works 3 cards in PCI-E 16x slots with 16x risers work I get black screen (no POST) when: Using 2 cards directly plugged in and the other 2 in 16x risers. I live in Houston Texas and have a setup here at home. I will give .6 btc if anyone wants to come and try a solution.
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coin123123
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December 25, 2013, 06:56:26 PM |
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now enough watt. try to power two cards from second psu.
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dE_logics
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December 26, 2013, 03:00:15 PM |
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WOW MAN WOW!!!! What OS?
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joshv06 (OP)
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December 26, 2013, 05:33:52 PM |
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Wouldn't 1500W be enough for 4 R9 290's? I used to run a full system with fans, 2 hdd's, 4x 7970s on an Enermax 1350W.
Also, I made powered risers. They work, but it's the same thing. I can't get 4 cards at once to work.
My board does not require shorting the a/b pins. The 1x riser works.
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vm1990
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Activity: 1540
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December 26, 2013, 09:34:43 PM |
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this might sound strange but crossfire the card in the x1 slot to the 1st card in the 1st x16 slot
1500w should be more than enough for these configurations
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Cascaders28
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December 26, 2013, 09:43:24 PM |
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What BIOS version are you using?
I think you'll actually need to make sure CF is off in the BIOS and you're not using any bridges for this board to support more than 3 cards. That is where my mind starts at least...
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af_newbie
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December 26, 2013, 11:22:00 PM |
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Wouldn't 1500W be enough for 4 R9 290's? I used to run a full system with fans, 2 hdd's, 4x 7970s on an Enermax 1350W.
Also, I made powered risers. They work, but it's the same thing. I can't get 4 cards at once to work.
My board does not require shorting the a/b pins. The 1x riser works.
I run three R9 290x with 1200W PSU and I put the 4th card on 450W second PSU. All four are on powered risers. I'm using the same motherboard, default BIOS settings, Sempron 145 CPU, SSD drive.
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Trini8ed
Sr. Member
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<3 Bitcoins
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December 26, 2013, 11:34:36 PM |
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Wouldn't 1500W be enough for 4 R9 290's? I used to run a full system with fans, 2 hdd's, 4x 7970s on an Enermax 1350W.
Also, I made powered risers. They work, but it's the same thing. I can't get 4 cards at once to work.
My board does not require shorting the a/b pins. The 1x riser works.
Have you tried a different board? Maybe the single board you are testing on isn't functionally correctly, I'd try another board.
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undeadbitcoiner
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December 26, 2013, 11:41:14 PM |
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Wouldn't 1500W be enough for 4 R9 290's? I used to run a full system with fans, 2 hdd's, 4x 7970s on an Enermax 1350W.
Also, I made powered risers. They work, but it's the same thing. I can't get 4 cards at once to work.
My board does not require shorting the a/b pins. The 1x riser works.
I run three R9 290x with 1200W PSU and I put the 4th card on 450W second PSU. All four are on powered risers. I'm using the same motherboard, default BIOS settings, Sempron 145 CPU, SSD drive. ! +1 Did you tried changing motherboard? I dont thisk its issuee with PSU
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Boxman90
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December 27, 2013, 01:44:03 AM |
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TDP is 275 for a R9 290, so the PSU has plenty of power. I'm running 4 GPU's on my GigaByte motherboard. I use 1x risers on all cards. What might be the key is running the presence mod on all PCI-e slots It's what I needed to get my 4x GPU running and detected. Otherwise, I can confirm that with the presence mod, the Gigabyte 990FXA-GD65 works on 4 GPU's (with some GPU's in the 1x slots, all slots on presence mod. Even the 16x slots). The GD65 also has the great extra power plug near the PCI-e slots. Yes, you might not heed the a/b shorting mod with one card in the 1x slot and nothing for the rest, same with me. But with 4 cards, it was MANDATORY to do the mod on _all_ slots, even the 16x ones. Otherwise it did not work for me either.I used thin paperclips bent into shape with some pliers. Good luck, and look forward to the bounty. 1427iTKC5ygVBqeFjMj6YRkB9dtRnAgZA7
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woutersteven
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December 27, 2013, 01:51:57 AM |
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According to this benchmark: http://www.techspot.com/review/736-amd-radeon-r9-290/page8.html, the R9 290 takes 350 watts. Four cards would be 1400 Watts, add 125 watt for the cpu and the rest of the system and you're at 1525 Watt. A 1500 Watt PSU at 80% gives at most 1200 watts reliably, so perhaps one PSU wouldn't be enough to handle the load. However this is at 100% load, which it will never reach during POST sequence.
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Boxman90
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December 27, 2013, 01:57:37 AM |
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According to this benchmark: http://www.techspot.com/review/736-amd-radeon-r9-290/page8.html, the R9 290 takes 350 watts. Four cards would be 1400 Watts, add 125 watt for the cpu and the rest of the system and you're at 1525 Watt. A 1500 Watt PSU at 80% gives at most 1200 watts reliably, so perhaps one PSU wouldn't be enough to handle the load. However this is at 100% load, which it will never reach during POST sequence. 1500W is the power it will provide on the 12v side. With 80% efficiency it'll draw about 1875 Watts from the socket. Modern PSU's have no problem providing top power 100% of the time. My mining rigs are stable for many months at 24/7 100% PSU load (1200W on a 1250W Seasonic PSU). Power is really not the issue. CPU doesn't draw 125 Watt either, as all you need is the cheapest dualcore you can find.
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woutersteven
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December 27, 2013, 02:02:31 AM |
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1500W is the power it will provide on the 12v side. With 80% efficiency it'll draw about 1875 Watts from the socket.
Modern PSU's have no problem providing top power 100% of the time. My mining rigs are stable for many months at 24/7 100% PSU load (1200W on a 1250W Seasonic PSU).
Power is really not the issue. CPU doesn't draw 125 Watt either, as all you need is the cheapest dualcore you can find.
I stand corrected, thanks I didn't know it was measured on the 12v side.
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Boxman90
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December 27, 2013, 02:08:31 AM |
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We're all here to learn
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dE_logics
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December 27, 2013, 07:23:04 AM |
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Regardless, the cards should be detected when they're not in use.
If you use Linux, I can help.
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joshv06 (OP)
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December 27, 2013, 12:02:58 PM |
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TDP is 275 for a R9 290, so the PSU has plenty of power. I'm running 4 GPU's on my GigaByte motherboard. I use 1x risers on all cards. What might be the key is running the presence mod on all PCI-e slots It's what I needed to get my 4x GPU running and detected. Otherwise, I can confirm that with the presence mod, the Gigabyte 990FXA-GD65 works on 4 GPU's (with some GPU's in the 1x slots, all slots on presence mod. Even the 16x slots). The GD65 also has the great extra power plug near the PCI-e slots. Yes, you might not heed the a/b shorting mod with one card in the 1x slot and nothing for the rest, same with me. But with 4 cards, it was MANDATORY to do the mod on _all_ slots, even the 16x ones. Otherwise it did not work for me either.I used thin paperclips bent into shape with some pliers. Good luck, and look forward to the bounty. 1427iTKC5ygVBqeFjMj6YRkB9dtRnAgZA7 I have tried this. Shorting the 1x slot with a card on a 1x riser while the other 3 cards are plugged directly in. Same problem. No POST. I also tried putting the HDMI cable in each card while booting. Also some notes: Booting the card from a 1x slot with a 1x riser with and without shorting the A/B pins works perfectly.
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Boxman90
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December 27, 2013, 01:34:22 PM |
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TDP is 275 for a R9 290, so the PSU has plenty of power. I'm running 4 GPU's on my GigaByte motherboard. I use 1x risers on all cards. What might be the key is running the presence mod on all PCI-e slots It's what I needed to get my 4x GPU running and detected. Otherwise, I can confirm that with the presence mod, the Gigabyte 990FXA-GD65 works on 4 GPU's (with some GPU's in the 1x slots, all slots on presence mod. Even the 16x slots). The GD65 also has the great extra power plug near the PCI-e slots. Yes, you might not heed the a/b shorting mod with one card in the 1x slot and nothing for the rest, same with me. But with 4 cards, it was MANDATORY to do the mod on _all_ slots, even the 16x ones. Otherwise it did not work for me either.I used thin paperclips bent into shape with some pliers. Good luck, and look forward to the bounty. 1427iTKC5ygVBqeFjMj6YRkB9dtRnAgZA7 I have tried this. Shorting the 1x slot with a card on a 1x riser while the other 3 cards are plugged directly in. Same problem. No POST. I also tried putting the HDMI cable in each card while booting. Also some notes: Booting the card from a 1x slot with a 1x riser with and without shorting the A/B pins works perfectly. Just for shits 'n giggles, put them all on 1x risers and short all 4 slots? I mean, at my Gigabyte board one card on a 1x riser in a 1x slot works fine too. All 4 at once caused the problem. Just try it mate.
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joshv06 (OP)
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December 27, 2013, 03:16:10 PM |
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Will try that
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