Improve company productivity with a Business Account.Sign Up

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 272
  • Last Modified:

Memory Speed?

With a display of 1280 by 1024 pixels & a refresh rate of 72 Hz, how do I find how fast the memory is?  I know the answer is 10 nanoseconds, but how do you get THAT?  I've looked everywhere & have found NOTHING.  

Please Help.
0
waxyice
Asked:
waxyice
  • 3
  • 2
1 Solution
 
sysbw1Commented:
I believe this would be the limitation of the chips used. I don’t know that there is a specific formula for taking the resolution and refresh rate to come up with the speed of the memory.
0
 
complexymetronCommented:
Hi!

Which memory? The one from the graphics card or the one from the display?
With the data provided you'll be able to calculate pixel clock (1280x1024x72/sec = 94.3 MHz).
If you're looking for the display's memory speed, you could just calculate: 1 / 94MHz = 10ns, which would match your questioned value.

If you're looking for the equation for the graphics card memory speed, there's an easy explanation for your failed search for information: it depends on what the manufacturer of the GPU designed into its chip. You can't tie the pixel clock to memory acces, becaus todays GPUs are capable of far more than just displaying pictures pixel by pixel.
They're able to calculate and transform complex 3-dimensional sceneries. So with every pixel you can see, there is far more information involved than just the color. BTW the fastest memory on graphics cards today is about 2.6 ns and even with that, GPUs aren't capable of delivering 72 frames per second all the time.

I hope I could clear things up a bit. If you're to confused, just ask again :)
0
 
sysbw1Commented:
Very cool, I had no idea :) I remember the days of calculating HOW MUCH memory you needed to display a res / color depth. God, am I old...lol
0
Worried about phishing attacks?

90% of attacks start with a phish. It’s critical that IT admins and MSSPs have the right security in place to protect their end users from these phishing attacks. Check out our latest feature brief for tips and tricks to keep your employees off a hackers line!

 
waxyiceAuthor Commented:
Okay, just to see if I have the hang of it, see if this is correct...
with a display of 640 by 480 @ with a refresh rate of 60 Hz

640 x 480 x 60 = 18.4MHz

1/18.4 = 5ns?
0
 
waxyiceAuthor Commented:
Opps, I did the final math wrong.  It would be 54 ns.
0
 
waxyiceAuthor Commented:
Thanks you both for your help!  :)
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now