Topic: RISERS for 2 coins (Read 4455 times)
PLZ BUY RISERS
Price lowered to 2 coins.
Still have around 30 cables for sale.
With core OC and memory DC 5970 draw might be a little more or a little less than 300w. I heard a good psu will actually give you more than what they are rated. I think 4 is pushing it but you might be able to get away with it. I was looking at this 1000w cooler master with 8 PCIE cables and it says max output is 1200w. It will probably give you 1250 but if you really push your psu or board like that you might have problems with or without the molex.
1) 3x5970 pulls 800W DC which is about 870W AC at the wall (that includes rest of system too). Mining w/ downclocked ram saves a lot of wattage.
2) Please never recommend someone pull 1250W from a 1000W PSU. A 1000W PSU shouldn't pull more than 1000W MAX continually. Ever. Period. If someone needs 1250W they need a 1250W PSU. 25% of rated power is a good way to burn down a home if the overcurrent protection fails.
If you run 24/7 1kw full load you should probly take 5-10% capacitor aging into consideration also...so 900W for 1kw max. Most peak 1100w...good ones atleast so you have 200w buffer just in case.
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Well 75W is the spec but how do you know it pulled more than 30W? 5 card @ 30W = 150W. If the MB wasn't designed to handle more than 120W you could easily kill the MB without any card pulling more than 30W. I am not saying people shouldn't use powered extenders I was just trying to clear up some of the completely false claims.
Because it was either the only card in the system or it was a 5970 + 5870 (I can't recall on this specific board), so in either case, it was beyond spec, even if it was a two card system. This particular motherboard only had two PCIe slots, so I know there was no more than 2 cards in there at any one time and I know it was not two 5970's, since the PSU on that machine was only a 500w PSU.
With core OC and memory DC 5970 draw might be a little more or a little less than 300w. I heard a good psu will actually give you more than what they are rated. I think 4 is pushing it but you might be able to get away with it. I was looking at this 1000w cooler master with 8 PCIE cables and it says max output is 1200w. It will probably give you 1250 but if you really push your psu or board like that you might have problems with or without the molex.
http://www.amazon.com/Cooler-Master-Silent-Modular-Supply/dp/B003O8J12I/ref=sr_1_2?ie=UTF8&qid=1328504102&sr=8-2
http://www.amazon.com/Cooler-Master-Silent-Modular-Supply/dp/B003O8J12I/ref=sr_1_2?ie=UTF8&qid=1328504102&sr=8-2
Not sure how this one performs but Coolermaster PSUs are on average just ok, nothing special.
Pulling 1200W from a 1000W can be fine for running some benchmarks but not for everyday 2-6hour gaming use or worse - 24/7 mining. I would advise to keep the load @ 80, max 90%, I have burned my ATX 24pin connector in a VX550W after mining two weeks 24/7 with ~550W load. Got the connector replaced, working fine now, but the motherboard connector is now brown (was white;)).
30W may be spec, but I can tell you cards pull more than spec often, especially when overclocked. I'll be happy to send you a couple motherboards to prove it.
Well 75W is the spec but how do you know it pulled more than 30W? 5 card @ 30W = 150W. If the MB wasn't designed to handle more than 120W you could easily kill the MB without any card pulling more than 30W. I am not saying people shouldn't use powered extenders I was just trying to clear up some of the completely false claims.
Per the post I responded to 4x5870 @ 30W ea = no need for powered extenders. A single 5970 @ 30W = MUST HAVE powered extender.
Wrong info is wrong info.There is no hard and fast rule and people need to decide what they are comfortable with. The reality doesn't fit into a sound bite but here are some ideas:
1) High end cards tend to draw less from the bus and more from the dedicated connectors because they are more reliable. So the idea that a 5770 might be fine but a 5970 must be dangerous is actually backwards.
2) The more CARDS (not GPU) you have installed the more you need to consider powered extenders. 6x5870s is going to draw more from the bus than 4x5970s despite having less GPUs.
3) The harder you overclock the more wattage you are going to pull and some share of that is going to come from the bus.
4) The more PCIe 1x slots you use the more you should consider powered extenders. A card in PCIe x16 slots is going to pull the same from the bus extender or direct thus hopefully the designer planned on that wattage being used. However a PCIe x1 slot normally doesn't pull more than 10W or less. Using a board w/ lots of PCIe 1x slots may indicate the MB can't handle 150W+
5) Downclocking memory helps a lot and since 5000 series can go as low as 150Mhz (model dependent) they are going to pull less wattage than a similar caliber 6000 series card.
With core OC and memory DC 5970 draw might be a little more or a little less than 300w. I heard a good psu will actually give you more than what they are rated. I think 4 is pushing it but you might be able to get away with it. I was looking at this 1000w cooler master with 8 PCIE cables and it says max output is 1200w. It will probably give you 1250 but if you really push your psu or board like that you might have problems with or without the molex.
1) 3x5970 pulls 800W DC which is about 870W AC at the wall (that includes rest of system too). Mining w/ downclocked ram saves a lot of wattage.
2) Please never recommend someone pull 1250W from a 1000W PSU. A 1000W PSU shouldn't pull more than 1000W MAX continually. Ever. Period. If someone needs 1250W they need a 1250W PSU. 25% of rated power is a good way to burn down a home if the overcurrent protection fails.
30W may be spec, but I can tell you cards pull more than spec often, especially when overclocked. I'll be happy to send you a couple motherboards to prove it.
PCIe Extenders with molex are needed on any dual GPU card. Your 5970's, etc, all need Molex cables to ensure you do not damage your motherboard from over draw.
This is just false. All that matters is total load of PCIe bus. BTW. A 5870 pulls ~30W from the bus. A 5970 pulls ~30W from the bus. So why does a 5970 need a powered extender but a 5870 doesn't?
Bump for awesome sale and crazy fast shipping!
Thanks BTC guy, that was here in 2 days since you pm'd me you shipped..
Thanks BTC guy, that was here in 2 days since you pm'd me you shipped..
With core OC and memory DC 5970 draw might be a little more or a little less than 300w. I heard a good psu will actually give you more than what they are rated. I think 4 is pushing it but you might be able to get away with it. I was looking at this 1000w cooler master with 8 PCIE cables and it says max output is 1200w. It will probably give you 1250 but if you really push your psu or board like that you might have problems with or without the molex.
http://www.amazon.com/Cooler-Master-Silent-Modular-Supply/dp/B003O8J12I/ref=sr_1_2?ie=UTF8&qid=1328504102&sr=8-2
http://www.amazon.com/Cooler-Master-Silent-Modular-Supply/dp/B003O8J12I/ref=sr_1_2?ie=UTF8&qid=1328504102&sr=8-2
I'm not sure how you can be drawing 1000w from the wall with 3 5970's and a 5830. You may want to remeasure that. 3x 5970 = 900w and I can't imagine everything else only taking 100w. At the wall, no less.. which means you are only drawing ~750w DC? I just can't see that happening with a fully loaded set of GPUs.
Anyway, they are easy to make yourself if you've got a fine tipped soldering iron. It's 5 wires you have to remove from the PCB end, solder together onto a molex and away you go.
Anyway, they are easy to make yourself if you've got a fine tipped soldering iron. It's 5 wires you have to remove from the PCB end, solder together onto a molex and away you go.
No joke, my machine is currently plugged into a Kill A Watt meter and it hovers around 1000w at full load. Configuration has changed a bit since the original post but it's extremely barebones. Linuxcoin running off of a usb stick with no extra drives, 3 5970s clocked at 820/250, and 1 5830 at 780/250. I'm thinking I can replace that 5830 with another 5970 if I use powered pcie extenders.
I think what littleshop and imsaguy said is more accurate information.
There are so many factors in needing molex or not. One is overclocking. If you overclock you can be drawing more then the rated power per card and that certainly changes things.
If you use no x1 to x16 adapters (in other words only put x16 cards in x16 slots), AND none of your cards are dual GPU AND do not overclock you should not need molex.
If you start using x1 to x16 and your cards are dual GPU you should use molex. It may work, but you are probably over limit for the design.
If you use no x1 to x16 adapters (in other words only put x16 cards in x16 slots), AND none of your cards are dual GPU AND do not overclock you should not need molex.
If you start using x1 to x16 and your cards are dual GPU you should use molex. It may work, but you are probably over limit for the design.
BTW TY crazyblane for sharing your experience with your 5970s. Im sure as this conversation carries on we will have more people confirming the molex is NOT a must have.
Mine are sealed in the factory anti static bag.
Granted. And I will buy some from you on my next rig build. But he was looking for powered adapters, and unhappy with the price at Cablesaurus so I pointed him to what he wanted.
Understood. There is much debate going around and since this is my thread i just want to make my opinion. The molex is not necessary for everybody. Sealed risers are better. You can always buy mine cheap and add the molex yourself. I will also negotiate the price if you buy in bulk.
I dont doubt what you guys are saying. Im sure in some situations the molex is a good idea. But to say its needed for any and all dual chips or more than 4 cards is complete bullshit. What should be said is they might be a good idea if your using cheap equipment or trying to run more cards than what your board was intended. If you have a decent board and psu that was designed for multiple cards you will not NEED the molex. Your equipment will run just fine without it and you will have saved yourself some money.
Ok. Here's what it boils down to.. the PCIE spec allows for up to 75watts to be pulled through a PCIE slot. Most cards only pull 25watts, with your higher end/dual gpu cards pulling the full amount. Some board manufacturers will cut corners and think "They won't use all 6 PCIE slots at one time, so we'll only account for 150 watts for that" and go cheap. Then you go and use risers to make more cards fit than what would normally and before you know it, you've got 6x25=150watts of draw. Ok, not an issue. The board the designed for 150 watts. If any of those cards starts pulling more than 25watts and the board was made cheaply, you're screwed.
See how both sides can actually be right in this situation? It really comes down to your exact mix of hardware. So you run 6x5830s. We all know different brands run their cards slightly different. One person's 6x5830 might pull more than a different person's 6x5830s. Its easier to make a blanket statement about using molex than it is to go and explain all of this, especially to n00bs.
That being said, I think 22.95 for a riser is a bit much, although I have bought some when I couldn't get them elsewhere.
Interesting direction this thread has gone... I've had 3 5970s and a 5830 going strong for about 4 months on standard extenders without issue(1200watt corsair,gigabyte ud3 mb). I never thought about overdrawing power from the pcie connector but this thread has me thinking. I'm only drawing 1000w at the wall but I can't get my system to boot with any more cards. I'm thinking I need a pcie extender with molex, and that I'm lucky I haven't burnt anything out yet.
With that said, I hesitently started to order one from cablesaurus. $22 is ridiculous, add $6 shipping on top of that and it's enough to make me change my mind. From the pics it looks like they just soldered a single pin molex connector to one of the exposed pcie pins. I may break out the old soldering gun and make a few myself. Anyone have any experience making their own?
I'm not sure how you can be drawing 1000w from the wall with 3 5970's and a 5830. You may want to remeasure that. 3x 5970 = 900w and I can't imagine everything else only taking 100w. At the wall, no less.. which means you are only drawing ~750w DC? I just can't see that happening with a fully loaded set of GPUs.
Anyway, they are easy to make yourself if you've got a fine tipped soldering iron. It's 5 wires you have to remove from the PCB end, solder together onto a molex and away you go.
Mine are sealed in the factory anti static bag.
Granted. And I will buy some from you on my next rig build. But he was looking for powered adapters, and unhappy with the price at Cablesaurus so I pointed him to what he wanted.
Mine are sealed in the factory anti static bag.
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