rec.autos.simulators

N4 - Frame Rate - Where's the bottle neck

Larr

N4 - Frame Rate - Where's the bottle neck

by Larr » Tue, 10 Jul 2001 00:49:35

Yes, N4 is very CPU dependant.

Back when I was running an Athlon 800 and GeForce 256 DDR, I was torn
between a processor upgrade and a video card upgrade.  I went with the video
card upgrade for two reasons.  I felt the GeForce 256 DDR was out of steam,
and to upgrade the processor I would also have to buy a new motherboard (I
had a slot-a).

So I bought a Hercules GeForce II GTS Pro card.

I saw a _reasonable_ increase in N4 performance.  About 10fps.  I was
running around 40fps max.

A month or so later, I decided what the hell.  Might as well do the whole
thing.

So, I upgraded the Motherboard to an ASUS A7V133, and put in an Athlon
1.2Ghz DDR processor.

My N4 fps jumped from 40fps max to 75+ fps, tickling 80fps from time to
time.

I run ALL graphics levels at 100%, 32 cars ahead, and I think 16 cars
behind.

Of course, I'm affected by on-screen stuff as much as anyone else,
especially smoke.  Smoke is THE big frame rate killer...

-Larry

> I'd agree with you about your CPU being the bottle neck there, as the
> CPU load will rise greatly with more cars in front. You're pretty much
> right about the Geforce doing the same work in both cases, but CPU
> load is much lower when you're viewing the replay, because there are
> no AI and physics calculations to be done.

> I can't really comment from my system, because it's very different,
> but you could always try overclocking it a bit and see how you go. And
> obviously try the graphics tweaks mentioned, see how they work out.

> Rafe Mc



> >Does Graphics detail like world detail eat up cpu cycles?  The reason
> >I ask is the fact that I get great frame rates in replay when,
> >technically, the work that the Geforce is doing is the same as in the
> >race, but the load on the CPU is much less.  Right now, I have world
> >detail set at about 70% I believe.  I draw 60% ahead, show all cars
> >ahead and 4 behind.  I show some objects for world detail and have car
> >detail set on the highest.

> >I have all ready gone through the tweaks posted by Les Marton (very
> >excellent guide by the way).  I moved up from a TNT2 Ultra and was
> >hoping to get much better fps.  The only real advantage I have found
> >is that I can run OpenGL (which looks much better) and I can turn up
> >graphics options much higher, but at a certain point, turning down
> >graphic options yields very small fps increases.

> >I keep my system pretty clean so very little is running in the
> >background.  My wheel is a USB wheel.  I will try upgrading to DX 8a
> >if I dont have it and see if that makes a difference.




> >>> check the main graphic detail slider (can't remember the name of it),
> >>> you might want to try turning it down to around 60% or so - a little
> >>> in either direction can have a major impact.

> >>That's the World Detail slider.  It'll have a definite impact on your
> >>framerates.  Like the poster says, turn it down to a little over halfway
> >>& check it out.  Then adjust to suit.

> >>--

> >>Fester

> >Brian Oster  Remove NOSPAM from my email to reply.


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