HT201805: About graphics-card compatibility between Mac Pro models

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Br0K3n T0y

Q: HD 5870 Black screen fps drop

Hi, I am running a Radeon HD 5870 and normal day to day usage it will run perfectly quiet and with no issue ( normal usage being Photoshop ). I decided to do a bench mark with Unigine Valley demo on extreme hd settings. It runs fine and after about 1-2 mins the fan begins to make its presence felt. Anytime between 3-5 mins the fan is near enough full speed. Then, sometimes it will lag and drop from 24 (ish) fps to around 5 fps and then after not much longer, it will black screen.  I do not get any artefacts on screen and when usage drops ( between demo scenes ) the fan will drop quite quickly according to what is happening on screen, so if it was over heating the fan should really stay full on until it cools. I am at a loss as what is happening. Hopefully someone could shed some light on this.

 

My setup is a Mac Pro 2008,

32 gb 667mhz ram,

2 x 2.8 quad,

2 x 500gb RAID 0 El Capitan install

2 x 21" displays @ 1920 x 1080,

HD5870 running both displays ( non Apple/ non flashed )

HD 2600XT ( Apple OEM ) installed ( but not running any displays ) as back up incase of boot issues.

 

thanks

Mac Pro, Mac OS X (10.6.7)

Posted on May 15, 2016 9:14 AM

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