Snowing via the ATI 4870?

[Jeremy Garchow]

I was linking to the repeater, more so than the cables. It’s cheaper than the Geffen.

Jeremy

[Erik Lindahl]

Not sure if it helps but I can “confirm” that we use a similar system as your self with out any issues.

– Quad MacPro 2.8
– Radeon 4870 (DVI / Display Port)
– 23″ Apple display
– 20″ Apple display

We run the DVI cables about 15 meters with out any issues. We do have a set of repeaters however (unsure of brand). I was a bit worried about the Display Port but everything works as before (using a Display Port > DVI adaptor from Apple). So the GPU and Display Port > DVI should work, given your setup is a bit different.

As for Gefen we’ve only had good experience with them also. We use a 2×2 DVI / USB KVM in the second suite. One thing we where required to get there was so called “DVI Detectives” for each port however since we had issues with blinking / switching screens. These solved all those problems there.

https://www.gefen.com/kvm/dproduct.jsp?prod_id=4714

Erik Lindahl
Freecloud Communication
————————

[George Strother]

Walter

It’s probably not your long cable runs. Apple has already replaced the 4870 card in new MacPro 8core, then replaced the whole Mac for the same problem.

I’m connected by DVI-D to a Dell 30″. The same monitor and cable work fine with my retired G5 and 3 yr old HP.

Changing the 4870 card had no effect and the replacement MacPro blinks less often but snows much more than the first MacPro.

Connecting the MacPro (first or replacement) to my JVC 20″ LCD production monitor by DVI-D shows the same blinking and snow problems in spite of it’s lower resolution.

Here is a thread about the problem in the Apple support forum – https://discussions.apple.com/thread.jspa?threadID=1947029&start=0&tstart=0

No real answers in the thread, but at least you know you are not alone.

The consensus seems to be firmware and drivers that are not compatible with legacy or third party monitors.

George
Light Images