The Multi-Display Bug Still Persists with Nvidia Pascal Causing Increased Power Draw
There is reportedly some weird multi-display bug in Nvidia’s drivers that is causing the new GeForce GTX 10-series graphics cards to run at much higher clock speeds than what the Windows desktop would require. The issue only happens when multiple high refresh rate displays are connected to the DisplayPort outputs on a GeForce card. This results in increased power draw and heating up the desktop.
The issue was first reported at the beginning of the year, in a test using Nvidia’s 364.47 driver set, a GeForce GTX 980 Ti card, and two monitors set above 60Hz. The result had it that the idle clock speed rose from 135 MHz to 925Mhz upon adding the second monitor, and then reinstated when it was disconnected.
The test was conducted again this week by The Tech Report and sadly, the multi-display bug still seems to persist. They used a Gigabyte GeForce GTX 1080 Xtreme Gaming card, with a test bench having the Eizo Foris FS2735 FreeSync display with a 144Hz refresh rate, and the Asus ROG Swift PG2790 G-Sync display with a 165Hz refresh rate.
Both monitors were connected to the GTX 1080’s corresponding DisplayPort outputs, and clock speeds were monitored using Gigabyte’s Xtreme Gaming Engine software.
At first, they connected the GTX 1080 with the Asus PG2790 and the idle clock speed remained at the expected 291MHz as the monitor was set to run between 60Hz and 165Hz. The system consumed an overall power of about 65W to 75W.
However, once the Asus monitor was set to run at 165Hz and the second Eizo Foris FS2735 at 60Hz was plugged in, the card clocked up to 1304MHz. The power draw from the system jumped up to about 107W on average as well.
Further, when the Eizo panel was cranked up to 144Hz with the Asus monitor set at 60Hz, the GTX 1080 clocked down to 291Hz at idle. Disabling the G-Sync feature on the Asus PG2790 however, had no effect on the card’s idle clock speed.
In conclusion, if you have two dispays running at high refresh rates, you might end up paying a higher power bill and unduly heating up your place until Nvidia fixes this weird issue.
Source: The Tech Report.