fastest refresh

[Patterson, James]

Just curious...why would you want to go that fast?

===========================================
James C. Patterson II, MD/PhD
Director of PET Neuroimaging Research
PET Imaging Center, Biomedical Research Foundation
Assistant Professor of Psychiatry
Louisiana State University Health Sciences Center at Shreveport
318-675-6040 - Psychiatry
318-675-6148 - fax
318-675-4000 - PET Center
318-675-4020 - fax
===========================================




> -----Original Message-----
> From: mike allerhand [mailto:michael.allerhand at ed.ac.uk]
> Sent: Wednesday, January 09, 2002 7:02 AM
> To: eprime at mail.talkbank.org
> Subject: fastest refresh
>
>
> What monitor and graphics card can get presentation
> intervals of 5ms (and below if possible)?
>
> Suppose you've got a monitor that can be driven at 160Hz
> vertical refresh, and a video card that can drive faster than that,
> and has, say, 32Mb on-board RAM.
> You've set the lowest resolution and color depth. You use
> small images. You set pre-release time
> to spare. You select the max refresh rate your monitor can
> handle, and tell eprime to present an image for, say, 6.25 ms
> (160Hz). Will you get what you want? Not necessarily.
> It's not easy to measure. We used a high-end storage 'scope
> to measure the response from a photocell. The fact is that
> it depends upon magic in the video card and driver.
> We found Sony and IIyama monitors that can go to 160Hz,
> but you have to get the right card. Just because the card says
> it can drive at 200Hz is no guarantee that you will get that
> out of eprime. For example we found ATI cards with sufficient
> video RAM that claimed to go fast enough could give at
> best a mulitple of two refreshes, ie. 12.5ms minimum.
> One card we found that does give 6.25ms is Matrox millenium G400 max.
>
> It would be useful to know what people are using to get low
> presentation intervals. Can anyone do 5ms or better?
>
> Mike
>
>
>