Am i right in calculating

ashfame · 30-04-2006, 09:30 PM

pci bandwidth is 133mbps.
That means it can transfer 133MB of data per second.
Now to have 60fps, each frame should not have a size more than 133/60MB = 2.216MB.
An image @ 1280 * 1024 resolution can't be greater than 2.216MB.

Then why pci cards are low on performances, i have heard newer games run like a slideshow on them, that's why i have stopped my search for a pci graphics card with 256MB ram.

Pl tell me where i am wrong?

cyrux · 30-04-2006, 10:13 PM

If your talking about pci-express (16x) cards they have a bandwidth of 8Gbps, i suppose...

ashfame · 30-04-2006, 10:50 PM

Quote:

Originally Posted by cyrux

If your talking about pci-express (16x) cards they have a bandwidth of 8Gbps, i suppose...

I am talking about pci not pci-e.
pci slots are white coloured slots where you insert modem, lan cards etc.

drvarunmehta · 01-05-2006, 12:11 AM

Thats not how graphics cards work. Each frame isn't a seperate image. Every object on the screen is actually a polygon which is rendered according to the players actions and the final output is put on screen.

ashfame · 01-05-2006, 11:06 AM

Quote:

Originally Posted by drvarunmehta

Thats not how graphics cards work. Each frame isn't a seperate image. Every object on the screen is actually a polygon which is rendered according to the players actions and the final output is put on screen.

So, is there any way one can calculate fps @ fixed resolution @ fixed refresh rate.

BTW, Whats the optimum level of refresh rates for newer games.

drvarunmehta · 01-05-2006, 11:30 AM

fps is a characteristic of the game and refresh rate is that of the monitor. For a CRT a refresh rate of 75 Hz is good enough.
Use Fraps to check your fps in any game. 40 fps should be good enough for most games although it depends on individual preference.

Andyiz · 02-05-2006, 01:30 PM

Quote:

Originally Posted by ashfame

pci bandwidth is 133mbps.
That means it can transfer 133MB of data

Mbps means mega bits per sec
and MBps means bytes per sec

When the speed is 133mbps then its equavalent Bytes(Bps) is
133/8=16.8 MBps

u r getting confused

hope this helps

ashfame · 02-05-2006, 06:05 PM

@ Andyiz

I just don't know the bandwidth of pci?
It is 133MBps or 133Mbps.

MysticHalo · 03-05-2006, 09:13 PM

133 megabits=133*10^6 bits=133000000 bits
133 megabytes=133*1024*1024*8 bits= 1115684864 bits

MBps=8.3*mbps

Card processing frequency varies with 64-bit or 128-bit interface....thats how many bits can be exchanged in one cycle.
But thats not all that matters....your monitor should have enough speed (refresh rate) to display all the frames that the card renders. BTW, ur calculation r completely baseless....its doesnt go like this.

ashfame · 04-05-2006, 07:59 PM

Fraps shows gta sa running on my Pc @ 10-12fps, but i don't think so.
For human eye to be not able to distinguish individual frames, 24 or higher frames should pass per sec.
But i don't think it runs as a slideshow.
Should i try another benchmark software.

Andyiz · 05-05-2006, 01:50 PM

Quote:

Originally Posted by ashfame

Fraps shows gta sa running on my Pc @ 10-12fps, but i don't think so.
For human eye to be not able to distinguish individual frames, 24 or higher frames should pass per sec.
But i don't think it runs as a slideshow.
Should i try another benchmark software.

Use PCmark. It wil let u know everything u want to.

MysticHalo · 05-05-2006, 02:25 PM

Well, 24fps stands valid only if the order in which things r going to be shown stand fixed(like a movie). But in a game, where its not possible to predict what the next frame will be, 24 fps can be distinguished by the eye, hence we have gfx cards that give uto 300 fps on some games (FPS over 24 in a game does make a difference, in a movie, it doesnt)