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<blockquote data-quote="pigoo3" data-source="post: 1918387" data-attributes="member: 56379">Completely understand needing to run El Capitan with the the older software.Since the Radeon RX 570 doesn't look like it will work out (unless you eventually are able to run a newer macOS version)...here are a couple more suggestions to get better performance.&nbsp; These are older video cards similar in vintage to the Radeon 5770.1.&nbsp; First is the Radeon 5870 (basically the big-brother of the Radeon 5770).&nbsp; You could get these in Mac Pro's similar to your's...thus it will definitely work with El Capitan.&nbsp; It has the same 1GB of RAM as the Radeon 5770...but the Radeon 5870 is supposed to be 2x as fast as the Radeon 5770. Looks like they're selling for about $40-$50 on eBay.2.&nbsp; Another option is the Radeon 7950.&nbsp; This was also an option back in the day to use with Mac Pro's like yours.&nbsp; It has 3 GB of RAM...should work with El Capitan...and I believe it's supposed to be even faster than the Radeon 5870.&nbsp; Also with 3GB of RAM...it might be capable of higher display resolutions.Here's some info on the Radeon 7950:[URL unfurl=&quot;true&quot;]https://www.techpowerup.com/gpu-specs/radeon-hd-7950-mac-edition.c2142[/URL]Here's an eBay link to a Radeon 7950.&nbsp; $75 right now...but still has 6 days left. <a href="https://www.ebay.com/" target="_blank">Electronics, Cars, Fashion, Collectibles &amp; More | eBay</a> (outdated link removed)Also saw some Radeon 7950's with &quot;Buy It Now&quot; prices of $200-$300.&nbsp; Mac video card versions are always more expensive.&nbsp; There's probably a Windows version of the Radeon 7950 that would be less expensive...but I'm not sure how &quot;plug &amp; play&quot; the Windows version would be. If interested in the Radeon 7950...but the Mac version of $200-$300 seems a bit $$$ steep.&nbsp; Maybe do some internet searches on the Windows Radeon 7950 version to see if/how compatible it is with your Mac Pro.Hope this helps,Nick</blockquote>

[QUOTE="pigoo3, post: 1918387, member: 56379"] Completely understand needing to run El Capitan with the the older software. Since the Radeon RX 570 doesn't look like it will work out (unless you eventually are able to run a newer macOS version)...here are a couple more suggestions to get better performance. These are older video cards similar in vintage to the Radeon 5770. 1. First is the Radeon 5870 (basically the big-brother of the Radeon 5770). You could get these in Mac Pro's similar to your's...thus it will definitely work with El Capitan. It has the same 1GB of RAM as the Radeon 5770...but the Radeon 5870 is supposed to be 2x as fast as the Radeon 5770. Looks like they're selling for about $40-$50 on eBay. 2. Another option is the Radeon 7950. This was also an option back in the day to use with Mac Pro's like yours. It has 3 GB of RAM...should work with El Capitan...and I believe it's supposed to be even faster than the Radeon 5870. Also with 3GB of RAM...it might be capable of higher display resolutions. [U]Here's some info on the Radeon 7950:[/U] [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/radeon-hd-7950-mac-edition.c2142[/URL] Here's an eBay link to a Radeon 7950. $75 right now...but still has 6 days left. [URL="https://www.ebay.com/"]Electronics, Cars, Fashion, Collectibles & More | eBay[/URL] (outdated link removed) Also saw some Radeon 7950's with "Buy It Now" prices of $200-$300. Mac video card versions are always more expensive. There's probably a Windows version of the Radeon 7950 that would be less expensive...but I'm not sure how "plug & play" the Windows version would be. If interested in the Radeon 7950...but the Mac version of $200-$300 seems a bit $$$ steep. Maybe do some internet searches on the Windows Radeon 7950 version to see if/how compatible it is with your Mac Pro. Hope this helps, Nick [/QUOTE]

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