Info The reason why many graphic cards may burn your power connector

May 26, 2019
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My ATX 24-Pin connector is burned after I run it with dual Asus Strix RX 570 OC.


I took weeks to find out the root cause, and here is the result:


Clearly, ATX 24-Pin is the bottleneck.
144W is not enough to support the whole potential power consumption from PCI-E slots.
Motherboard manufacturers don't tell you that.


There is one question unanswered: How much power graphic card drawn from PCI-E slot?
Thanks tom's HARDWARE, they test it! Here are some data from www.tomshardware.com

Power drawn from +12V PEG on Torture:
85.00W (Exceed limit! Peak: 116W!) - AMD Radeon RX 480 8GB
67.20W (Exceed limit! Peak: 70.8W!) - Asus Strix RX 570 OC <- Here you are.
67.20W (Exceed limit!) - Gigabyte GeForce GTX 1070 Ti Gaming 8G
66.46W (Exceed limit!) - Nvidia GeForce GTX 1050 3GB
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63.60W - Sapphire Nitro+ Radeon RX 580 Limited Edition (Boost Mode)
61.20W - Sapphire Nitro+ Radeon RX 580 Limited Edition (Silent Mode)
60.00W - GeForce GTX 1060 Founders Edition
56.95W - Gigabyte GeForce RTX 2080 Gaming OC 8G
55.20W - Zotac GeForce GTX 1080 Ti AMP Extreme
54.60W - Asus Strix RX 470 OC
53.60W - Asus Strix RX 460
52.80W - KFA2/Galax GeForce GTX 1080 Ti EXOC
52.80W - GeForce GTX 1080 Ti Founders Edition
52.11W - Nvidia Titan RTX
52.90W - Zotac Gaming GeForce RTX 2080 AMP
52.80W - Nvidia GeForce RTX 2080 Ti Founders Edition
52.80W - Nvidia Titan X Pascal 12GB
52.01W - Gigabyte GeForce RTX 2070 Gaming OC 8G
51.60W - Nvidia GeForce RTX 2080 Founders Edition
50.40W - Asus ROG Strix Radeon RX 560 4GB Gaming OC
49.55W - Aorus GeForce RTX 2080 Ti Xtreme 11G
49.47W - Gigabyte GeForce RTX 2060 Gaming OC Pro 6G
48.61W - ASRock Phantom Gaming X Radeon RX590 8G OC
48.41W - Asus ROG Strix GeForce RTX 2070 O8G Gaming
48.00W - ASRock Phantom Gaming X Radeon RX580 8G OC
48.00W - GeForce GTX 1080 Founders Edition
45.60W - Aorus GTX 1080 Ti Xtreme Edition 11G
43.20W - Zotac GeForce GTX 1070 Ti AMP Extreme
42.00W - EVGA GeForce GTX 1080 Ti FTW3 Gaming
42.00W - MSI RX 550 Aero ITX 2GB
39.60W - Asus ROG Poseidon GeForce GTX 1080 Ti 11GB Platinum Edition
38.40W - Asus ROG Strix GeForce GTX 1080 Ti 11GB OC
37.20W - Galax GeForce GTX 1080 Ti Hall of Fame
36.51W - GIGABYTE GEFORCE GTX 1650 GAMING OC 4G
35.82W - Gigabyte GeForce GTX 1660 Ti Gaming OC 6G
35.60W - MSI GeForce GTX 1050 Ti Gaming X 4 GB
32.40W - Sapphire Radeon RX Vega 64 Nitro+
32.40W - Gigabyte GeForce GT 1030 2GB
30.63W - AMD Radeon VII 16GB
30.00W - Asus ROG Strix Radeon RX Vega 64 8GB OC
30.00W - AMD Radeon Vega Frontier Edition 16GB
28.80W - PowerColor Red Devil RX Vega 64 8GB
28.80W - Gigabyte Radeon RX Vega 64 Gaming OC 8G
25.20W - Gigabyte Radeon RX Vega 56 Gaming OC 8G
----------------------------------------------------------------------------------------------------------------------------------------
10.80W - MSI GeForce GTX 1080 Ti Lightning Z
8.40W - MSI GeForce GTX 1080 Ti Gaming X 11G


Other information:
Motherboard usually uses over-spec power plugs, and this is why power connector always got burned first.



Conclusion:
  1. Watch out ATX 24-PIN, 12V@144W is its safe limit.
  2. Choose graphic card carefully if you want to use SLI/CrossFire.
  3. Motherboard should provide additional 12V plug for the need from PCI-E slots, but most of them don't.
 
Things generally don't melt unless you have a crappy PSU, but stranger things do happen.
Also if you don't have the "green" 8 pin ones plugged in, where do you expect power to come from?
It's all very logical and everything has it's set limits. If people choose to ignore them, then things happen.
 
Reactions: Mandark
Motherboard should provide additional 12V plug for the need from PCI-E slots, but most of them don't.
I think you will find any modern motherboard that supports Xfire will actually have these. Just because a motherboard has full length PCI-e slots, doesn't mean it can support multiple GPUs

Also, with your post here, why don't you list your entire computer specs with make/models? That way you would be helping people if they had the same or similar setup as you did.
 
May 26, 2019
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I think you will find any modern motherboard that supports Xfire will actually have these. Just because a motherboard has full length PCI-e slots, doesn't mean it can support multiple GPUs

Also, with your post here, why don't you list your entire computer specs with make/models? That way you would be helping people if they had the same or similar setup as you did.
Most additional 12V plugs in current motherboard is for "CPU-only". This is marked in picture as step 1. I am sad you don't catch that.
Can you list a consuming motherboard with many full length PCI-E slots without announcing they support SLI or CrossFire?
You will find out almost all of them do support SLI or CrossFire.
 

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