Custom Resolution Utility (CRU)
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02-25-2020, 05:56 PM
(Last edited: 02-25-2020, 05:57 PM by ToastyX)
Post: #4526
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RE: Custom Resolution Utility (CRU)
(02-22-2020 01:32 PM)wacha Wrote: All the DVI-I ports I'm testing should be DL as the GPUs support greater than 1440p digital resolutions, and they only have DVI-I as output. There is one special case that really baffles me. I have three GTX 295s. Whenever I try to install the drivers, they all default to 1440p using the adapter cable, but only one of them is able to give a display. The Gigabyte single-PCB GTX 295 works out of the box, 1440p 60Hz crisp image. The other two won't be able to display anything and I get a "no signal" message. So, my only way to even use one of those two cards is to first install the drivers on the Gigabyte, downgrade to 1080p or less, shutdown, and swap the cards. One of them is a Gainward dual-PCB model so I can understand that there might be hardware differences between the two. The other one is a ZOTAC single-PCB model, exactly identical as far as I can tell. The have the same BIOS version, same PCB layout (even the markings and numbering are the same), same driver version, same monitor, same DVI to HDMI cable, same OS, motherboard and other components. Yet one displays 1440p perfectly and the other just gives up when presented with a greater than 165 MHz pixel clock, it doesn't even default to 1080p like most of my other GPUs.The behavior will depend on whether it's treated as DVI or HDMI. Newer cards will output an HDMI signal over DVI ports if HDMI support is defined in the extension block. Older cards might only output DVI no matter what. If it's treated as DVI, you will get a blurry image beyond 165 MHz pixel clock because that's where it switches to a dual-link signal, but HDMI is single-link, so you lose half the pixels. Renaming the patcher to whatever-patcher-single.exe will make it always send a single-link signal, but that might not work with older cards. If it's treated as HDMI, AMD/ATI cards will output an HDMI signal over DVI ports, but only up to 165 MHz pixel clock unless the driver is patched. With the HD 7990, you shouldn't need the patch if you plug the monitor directly into an HDMI port. NVIDIA cards will output an HDMI signal over DVI without the 165 MHz limitation, but keep in mind older cards might not have the hardware to handle higher pixel clocks because old versions of HDMI only supported up to 165 MHz. The one GTX 295 probably has a better TMDS transmitter that is capable of higher pixel clocks. |
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