Topic Title: How to supply power to R9280X
Topic Summary:
Created On: 01/22/2014 07:14 AM
Status: Post and Reply
Linear : Threading : Single : Branch
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
 01/22/2014 07:14 AM
User is offline View Users Profile Print this message

Author Icon
SeaWiener
Peon

Posts: 1
Joined: 01/22/2014

Hello,

I'm inteding to run 6 R9 280X cards on an Asrock H81 Pro BTC board.
The cards have x16 PCI-E, 6-pin, and an 8-pin connection

The board has 1 PCI-E 2.0 x16, and 5 PCI-E 2.0 x1 slots.
The board also has 2 4-pin molex connections for extra power.

I will use 5 PCI-E x1 to x16 adapters for the x1 slots.
The adapters have a 4-pin Molex connected to them.

I will use 2 identical 1250W power supplies.

The cards will run at full load at all times
The only other components in the system are negligible.

My question is what would be the best way to connect the power supplies so that the load is equally shared?

Is the following scheme sensible?

Power supply A:
24-pin motherboard power
6-pin and 8-pin connectors of cards 1,2,3
4-pin molex connector on x1to x16 adapter of cards 4,5,6

Power supply B:
2x 4-pin molex connectors on motherboard
6-pin and 8-pin connectors of cards 4,5,6
4-pin molex connector on x1to x16 adapter of cards 1,2,3

 

Is there a better way to connect? How is the power consumption distributed between the PCIe, PCIe 6-pin and PCIe 8-pin? (I know the max possible wattage is 150w 75w and 150w respectively)

I don't know how the motherboard distributes the load to the PCIe x1 slots between the 24-pin power and the extra 2 4-pin molex, but maybe some here knows.

Thanks!

Statistics
86403 users are registered to the AMD Support and Game forum.
There are currently 3 users logged in.

FuseTalk Hosting Executive Plan v3.2 - © 1999-2014 FuseTalk Inc. All rights reserved.