Intel Motherboards - EP2C621D12 WS questions

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EP2C621D12 WS questions

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=11658
Printed Date: 05 Aug 2025 at 2:52am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: EP2C621D12 WS questions

Posted By: neoavalon
Subject: EP2C621D12 WS questions
Date 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