https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Fri, 10 Apr 2026 21:31:28 +0000 Sat, 15 Jun 2019 02:45:22 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=11658 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=11658&PID=63805&title=ep2c621d12-ws-questions#63805 Author: neoavalon
Subject: 11658
Posted: 15 Jun 2019 at 2:45am

Hi,

I'm reviewing possible motherboards for a build and have a few questions regarding the EP2C621D12 WS[URL=https://www.asrockrack.com/general/productdetail.asp?Model=EP2C621D12%20WS#Specifications]EP2C621D12 WS[/URL] and its use with 4 and possibly (in the future) 5 GPUs.

Q1) I've read somewhere that a firmware update of the board is necessary when adding more than 4 or up to 7 GPUs to this system. Is this true?

Q2) Does this board realistically support 4 GPUs in the first place? The manual shows 2x 8-pin ATX12V connectors for the CPU sockets. However there's no additional PCIe x6 or x8 receptacles on the board. The 12V lines for a single PCIe x16 slot can draw up to 5.5A (66W), meaning 4 cards could in theory draw up to 22A (realistically less but may spike close to this at times). The 24 pin ATX connector has 2x 12V lines each of which I think are safely rated up to 6A or a total of 12A which is well under the possible max draw of 4 cards.

I'm not using the GPUs for mining (otherwise I could use separately powered risers from a 2nd PSU and avoid the possible issue in Q2)

Thanks for any help]]> Sat, 15 Jun 2019 02:45:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=11658&PID=63805&title=ep2c621d12-ws-questions#63805