20pin power connector
- Thread starter dtranftw
- Start date
Solution
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
Well I guess you can try it. I do not think it will cause any issues(make sure you connect the 4 or 8 pin cpu power cable as well).
- May 18, 2007
- 23,815
- 5,265
- 108,890
The 24 pins connector is a hold-over from the days before ATX12V and PCIe where the CPU and everything else on the motherboard was powered through the 20 pins ATX connector. The total current was pushing the limits on 3.3/5/12V and one extra pin for each were added to bring the average current per pin back down.
Now that nearly everything is powered by the 12V rail alone and that the major loads have their own dedicated 12V feeds, the 24-pins ATX connector is superfluous and serve little purpose beyond maintaining compatibility with PSUs that have 24 pins connectors. Most motherboards should not care whether those extra pins are there or not - they are all soldered to the same copper trace/pour/plane and that's it.
Now that nearly everything is powered by the 12V rail alone and that the major loads have their own dedicated 12V feeds, the 24-pins ATX connector is superfluous and serve little purpose beyond maintaining compatibility with PSUs that have 24 pins connectors. Most motherboards should not care whether those extra pins are there or not - they are all soldered to the same copper trace/pour/plane and that's it.
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
Straight 12 volt boards would be great. Only a few OEM's do this.
We still need 5v for some devices(usb/ssd/parts of the hard drive/ect). It sure could simplify things.
I have run many first generation boards without this issue. I wonder how many boards this effected. PCI-e does not even have 5 volts as far as I know and one of those extra 4 was 5 volts.
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
A GTS 250 should hang out in the 150 watt peak area since a pci-e slot is rated for 75 watts and the 6 pin cable is rated for the same.
Please check the power supply label to see how may amps or watts it has at 12 volts since that is the rail that is most used.
Please check the power supply label to see how may amps or watts it has at 12 volts since that is the rail that is most used.
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
18 amps @ 12 volts(216 watts) is very low for a 400 watt power supply.
Is it a multi-rail unit by any chance? If it is it should list a combined output.
Is it a multi-rail unit by any chance? If it is it should list a combined output.
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
I am going to have to guess the second "cpu" rail has something else on it.
Does it list a combined for those 2 rails by any chance.
Does it list a combined for those 2 rails by any chance.
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
It is normally listed as 12v + 12vcpu must not exceed XXX watts or XX amps. They all show it a bit differently.
The reason it is important is your 400 watt power supply can not output 408watts(that would be if the rails added together. This rarely happens and as you can see it is more than the power supply is rated for)
Here is a multirail example image.
It would seem to have 30 amps(360 watts would be impressive from a 300 watt power supply) if you added the 2 12 volt rails.
It has 22amps(264 watts) combined. So as long as the 2 rails to not pass the set limits and the combined do not pass 264 watts, everything is good.
The reason it is important is your 400 watt power supply can not output 408watts(that would be if the rails added together. This rarely happens and as you can see it is more than the power supply is rated for)
Here is a multirail example image.
It would seem to have 30 amps(360 watts would be impressive from a 300 watt power supply) if you added the 2 12 volt rails.
It has 22amps(264 watts) combined. So as long as the 2 rails to not pass the set limits and the combined do not pass 264 watts, everything is good.
- May 18, 2007
- 23,815
- 5,265
- 108,890
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
You have 30 amps or 360 watts @ 12 volts.
That should be enough as long as it delivers its rated power.
Lower powered video cards like the 750 and 750ti are better options because they are more easy on the power supply if you can get one(and should be faster too).
That should be enough as long as it delivers its rated power.
Lower powered video cards like the 750 and 750ti are better options because they are more easy on the power supply if you can get one(and should be faster too).
nukemaster
Titan
- Nov 23, 2004
- 19,626
- 6
- 74,965
It should. It may be a bit hard on it, but the system should not need more than the power supply label lists(remember older power supplies start to loose some capacity so I would keep an eye on it.).
It is actually multi rail, but that is not an issue as such.
Lower powered cards may be a better long term bet(even a 5770 should take less and be faster), but for a second hand system, you work with what you have.
It is actually multi rail, but that is not an issue as such.
Lower powered cards may be a better long term bet(even a 5770 should take less and be faster), but for a second hand system, you work with what you have.
TRENDING THREADS
-
-
-
Question Help in troubleshooting possible graphics card issue?
- Started by nort99
- Replies: 3
-
Question RX 6600 visual glitches right after upgrading to it- Started by Wamek
- Replies: 4
-
News US sanctions transform China into legacy chip production juggernaut — production jumped 40% in Q1 2024- Started by Admin
- Replies: 35
-
Facebook
Twitter
Instagram