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Yamakasi Catleap Q270 (100hz guaranteed). - Page 104  

Poll Results: Would you be interested in buying a Yamakasi Catleap Q270 (100hz guarenteed)

 
  • 87% (726)
    Yes
  • 2% (18)
    No
  • 10% (88)
    Maybe
832 Total Votes  
post #1031 of 1131
I'd get one of these over a PCBank or a Crossover if there was some sort of a system in which the screens are actually checked for dead pixels and sold accordingly, like how you can request such a check from certain sellers. A better frame/bezel would also be a major selling point.
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post #1032 of 1131
Now the only thing I'm feeling crappy about is the SLI being capped at 100hz.

I doubt I could take advantage of 120hz (and reach 120fps) in modern games with a single 680 frown.gif
post #1033 of 1131
Quote:
Originally Posted by Sxcerino View Post

Now the only thing I'm feeling crappy about is the SLI being capped at 100hz.
I doubt I could take advantage of 120hz (and reach 120fps) in modern games with a single 680 frown.gif

Yeah that one I can't explain. Maybe if we all did a 2000-email mass message to Nvidia. Radars go off and they fix it in the next driver? Because it's just a driver issue. They, for some reason, only put in calculations up to 400mhz pixel clock under sli. even 1mhz more will kill the card off and you have to reboot the computer otherwise you're running solo-card.

But honestly, 100hz is really nice. tongue.gif It's 68% faster than 60hz, you know. =D
post #1034 of 1131
Thread Starter 
Quote:
Originally Posted by Smykster View Post

Okay, as per Ken's request once again, I'll clear up some misinformation regarding cable bandwidth and monitor refresh rates:
My message to Ken:
KK, did some number crunching for you. The effective data rate of a dual link DVI cable is 7.92 Gbits/second. With this in mind, the highest resolution dual link DVI supports at 120hz is 1920*1200. How do we know this? 1920*1200 = 2,304,000 pixels, 2304000 x 120(hz) = 276,480,000 x 24(bit color) = 6,635,520,000 or 6.63 Gbits/sec.
For a resolution of 2560*1440, lets do the math:
2560*1440 = 3,686,400 x 120(hz) = 442,368,000 pixels per second x 24(bit color) = 10,616,832,000 bits per second or 10.6 Gbits/second.
Dual-link DVI effective data rate = 7.92 Gbits/sec
HDMI 1.3/1.4 effective data rate = 8.16 Gbits/sec
DisplayPort 1.0/1.1 effective data rate = 8.64 Gbits/sec
2560*1440 @ 120hz = 10.61=Gbits/sec which is well over all of these.
Displayport 1.2 effective data rate = 17.28 Gbits/sec
HDMI Type B effective data rate = 20.40 Gbits/sec
Those would work with 2560*1440 @ 120hz
From the write up I did, I would hypothesize that the hardware is indeed pumping out 2560*1440 @ 120hz or greater, but the bandwidth is being exceeded and the monitor is is not showing many of the frames. Just like when you're gaming at 120hz yet you have a 60hz monitor, you're missing half the frames the hardware is pumping out.


Single link maximum data rate including 8b/10b overhead is 4.95 Gbit/s @ 165 MHz. With the 8b/10b overhead subtracted, the maximum data rate is 3.96 Gbit/s.

Did you get this "7.92 Gbit/sec" by saying 3.96 * 2 ? thats wrong..

Dual link maximum data rate is limited only by the bandwidth limits of the copper the DVI cable is constructed of and by the DVI signal's source.

source
post #1035 of 1131
Quote:
Originally Posted by bQvle View Post

Single link maximum data rate including 8b/10b overhead is 4.95 Gbit/s @ 165 MHz. With the 8b/10b overhead subtracted, the maximum data rate is 3.96 Gbit/s.
Did you get this "7.92 Gbit/sec" by saying 3.96 * 2 ? thats wrong..
Dual link maximum data rate is limited only by the bandwidth limits of the copper the DVI cable is constructed of and by the DVI signal's source.
source

Yup. Not that I have much of a reputation but I'd bet my reputation on having actually hit a real 120hz that is showing as 120hz on the monitor as well.
post #1036 of 1131
Quote:
Originally Posted by Smykster View Post

Okay, as per Ken's request once again, I'll clear up some misinformation regarding cable bandwidth and monitor refresh rates:
My message to Ken:
KK, did some number crunching for you. The effective data rate of a dual link DVI cable is 7.92 Gbits/second. With this in mind, the highest resolution dual link DVI supports at 120hz is 1920*1200. How do we know this? 1920*1200 = 2,304,000 pixels, 2304000 x 120(hz) = 276,480,000 x 24(bit color) = 6,635,520,000 or 6.63 Gbits/sec.
For a resolution of 2560*1440, lets do the math:
2560*1440 = 3,686,400 x 120(hz) = 442,368,000 pixels per second x 24(bit color) = 10,616,832,000 bits per second or 10.6 Gbits/second.
Dual-link DVI effective data rate = 7.92 Gbits/sec
HDMI 1.3/1.4 effective data rate = 8.16 Gbits/sec
DisplayPort 1.0/1.1 effective data rate = 8.64 Gbits/sec
2560*1440 @ 120hz = 10.61=Gbits/sec which is well over all of these.
Displayport 1.2 effective data rate = 17.28 Gbits/sec
HDMI Type B effective data rate = 20.40 Gbits/sec
Those would work with 2560*1440 @ 120hz
From the write up I did, I would hypothesize that the hardware is indeed pumping out 2560*1440 @ 120hz or greater, but the bandwidth is being exceeded and the monitor is is not showing many of the frames. Just like when you're gaming at 120hz yet you have a 60hz monitor, you're missing half the frames the hardware is pumping out.

so without connecting via displayport 1.2 (gtx 680?) you're not going to see true 120hz at 2560x1440?
is it possible to connect via displayport 1.2 or will it be on future releases?
my excitement has somewhat diminished for this monitor redface.gif
it now feels like more of a stepping stone as opposed to a milestone
post #1037 of 1131
Tell me if this makes any sense in regards to using the Catleap Q270 (overclocked) and gtx 680/or/gtx 680 sli - in terms of games like skyrim or other rpgs games, where the input lag makes less of an impact and consistency and smoothness has more.

Get a game I want to play (non-competitively), find the average framerate, set the refresh to the average framerate, set adaptive vsync to the refresh.

Lose a bunch of useage, gain a guaranteed consistent less-fluctuating fps.
post #1038 of 1131
Quote:
Originally Posted by punanigod View Post

so without connecting via displayport 1.2 (gtx 680?) you're not going to see true 120hz at 2560x1440?
is it possible to connect via displayport 1.2 or will it be on future releases?
my excitement has somewhat diminished for this monitor redface.gif
it now feels like more of a stepping stone as opposed to a milestone

Honestly - both sides offer differing facts. Both seem to know their ****.

I tend to veer towards the refresh output being significantly higher than 60hz. The only thing I am less than 100% on is the listed refresh at over-(arguably)estimated-bandwidth-level, actually being the listed refresh rate. Again - I don't pose myself as wise. Quite the opposite in this matter.

I would like more arguing. Please argue more wise ones.
post #1039 of 1131
Quote:
Originally Posted by Smykster View Post

Okay, as per Ken's request once again, I'll clear up some misinformation regarding cable bandwidth and monitor refresh rates:
My message to Ken:
KK, did some number crunching for you. The effective data rate of a dual link DVI cable is 7.92 Gbits/second. With this in mind, the highest resolution dual link DVI supports at 120hz is 1920*1200. How do we know this? 1920*1200 = 2,304,000 pixels, 2304000 x 120(hz) = 276,480,000 x 24(bit color) = 6,635,520,000 or 6.63 Gbits/sec.
For a resolution of 2560*1440, lets do the math:
2560*1440 = 3,686,400 x 120(hz) = 442,368,000 pixels per second x 24(bit color) = 10,616,832,000 bits per second or 10.6 Gbits/second.
Dual-link DVI effective data rate = 7.92 Gbits/sec
HDMI 1.3/1.4 effective data rate = 8.16 Gbits/sec
DisplayPort 1.0/1.1 effective data rate = 8.64 Gbits/sec
2560*1440 @ 120hz = 10.61=Gbits/sec which is well over all of these.
Displayport 1.2 effective data rate = 17.28 Gbits/sec
HDMI Type B effective data rate = 20.40 Gbits/sec
Those would work with 2560*1440 @ 120hz
From the write up I did, I would hypothesize that the hardware is indeed pumping out 2560*1440 @ 120hz or greater, but the bandwidth is being exceeded and the monitor is is not showing many of the frames. Just like when you're gaming at 120hz yet you have a 60hz monitor, you're missing half the frames the hardware is pumping out.

DVI Specification

Please see page 7. Dual-link DVI does not max out at 330mhz pixel clock.

Also see section 2.2.2.
Quote:
Originally Posted by Digital Video Interface Specification 
The single link only mode must be used for 25MHz to 165MHz T.M.D.S. clock operation and the first link can operate at above 165MHz T.M.D.S clock only in the case of the total bandwidth requirement surpassing 330MHz T.M.D.S clock.

Edited by kevinsbane - 4/17/12 at 8:04am
post #1040 of 1131
Thanks for the update bQvle!

I've been following the thread pretty closely for about 20-30 pages now(A LOT of downtime at work hehe) and the claims to 120hz or better seem very convincing to me.

Regarding the 'warming up' part, so you can cold boot and be at 100hz with no problems? How long of a warm up does it seem to take to bring it to 120hz?
I typically leave my computer on 24/7, but power the monitors off when I leave. Would I be needing to warm up the monitor to bring it over 100hz when I get back then?
Would I have issues leaving everything set to 120hz, turning the monitor off and coming back 12 hours later?

I'll be running off 570's SLI for a few months, so I suppose it won't matter for a while.
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IX
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