PC Spec

[Cookie]

The load of the GPU does not matter (as long not constant 100%)

Main thing is to have a high GPU + VRAM clock frequence.
Your GTX 660 is good because it has a wide 192 bit memory bus

GPL needs a fast bus for the transport of many small video pakets from the CPU to GPU

For GPL we use ~ 75% Cpu and 25% GPU

modern games do much more video computing of the GPU

[Christian Dauger]

The load of the GPU does not matter (as long not constant 100%)

Main thing is to have a high GPU + VRAM clock frequence.
Your GTX 660 is good because it has a wide 192 bit memory bus

GPL needs a fast bus for the transport of many small video pakets from the CPU to GPU

For GPL we use ~ 75% Cpu and 25% GPU

modern games do much more video computing of the GPU

I would rather have the opposite!
Even using CPUPower, with GPL, I get 25/30% load for the CPU and more load for the GPU. (40% I think)
But I am almost always at 59/60fps.

With GTL, (and still CPUPower) it uses only one core unfortunately and the GPU at 80/90% (fps 90/150)

Only with modern sims (Assetto, graphics at max) all cores are used (around 40%) and the GPU at around 80%

[Clive Loynes]

The load of the GPU does not matter (as long not constant 100%)

Main thing is to have a high GPU + VRAM clock frequence.

Well the idle clock on the GPU and its memory is at 324MHz

When I'm driving GPL then the GPU Memory goes to 800MHz and the GPU Core is at 700MHz.

I tried increasing the AA to 8x but it had no effect.

Obviously the GPU isn't idle but are those clock speeds adequate? 

I was running Assen67 in 55mod and what an awful place to have to learn at my time of life!  Never know which left-hander is coming next!

[Cookie]

Even using CPUPower, with GPL, I get 25/30% load for the CPU and more load for the GPU. (40% I think)
But I am almost always at 59/60fps.

The hw load says little about the GPL gaming quality - GPL needs speed

I tried the start at Spa67 with both the settings of the CPUPower shown above,  there was a big difference in smoothnes and sharpness of the game.

[Cookie]

@Clive

The full clocks would be ~ 980 and 1500

You are on the right way, but a pushing NV setting seems to be missing.

My problem atm is that I have no Win PC with NV GPU - so no idea how NV utility looks today in W...

Stefan made the install guide, when you scroll down to NV settings maybe you find it http://www.gplworld.de/en/grand-prix-legends/gpl-easy-installation-guide

[Clive Loynes]

Stefan's Nvidia stuff takes me well out of my comfort zone.
I've made some changes in line with his suggestions but all I can say is that I haven't killed it yet.
When I try starting at the back of a full grid of AI at Spa67, it drops the frame rate to thirty something. But it starts to recover almost immediately. It's up to 60 by Stavelot.

[Cookie]

Stefan's Nvidia stuff takes me well out of my comfort zone.
I've made some changes in line with his suggestions but all I can say is that I haven't killed it yet.
When I try starting at the back of a full grid of AI at Spa67, it drops the frame rate to thirty something. But it starts to recover almost immediately. It's up to 60 by Stavelot.

The 30 fps is the VSync wich halves  when not full 60 is possible, that is ok.

But important is the oHWM plot graph, showing the clocks - maybe it needs some time to switch to full speed. 

Maybe someone with a Windoze and NV graphic card can help....?

[Clive Loynes]

I'm not on my pc at the moment but I have found a magic setting in the Nvidia control panel.

I now sit on the grid at 45fps and it reaches 60fps on the way to Les Combes.

The GPU clocks spring straight to max when in the car and stay there.

[Cookie]

Now try
reduce the AA to 4
and

set the AFiltering to 16 full!

The detail slider in game to ~ 66%

The mirrors in game options in the medium position

[Clive Loynes]

Now try
reduce the AA to 4
and

set the AFiltering to 16 full!

The detail slider in game to ~ 66%

The mirrors in game options in the medium position

38fps on the grid but it improved at the start and was again at 60fps by Les Combes.

GPU Mem  running at 3004.7 MHz
GPU Core running at 1019.0 MHz

It was setting the Power Management Mode to Prefer Maximum Performance that woke it up.

[Clive Loynes]

Hmm..........

It would appear that off-line the CPU clock goes to max and stays there but when on-line the clock is all over the place.

I was running on the 55mod practice server and whilst the frame rate was a solid 60, the clock was not constant.

[Cookie]

Do you have more than one installs?

Does the path in igor show the same gpl55.exe as the GEM offline?

[Clive Loynes]

Do you have more than one installs?

Does the path in igor show the same gpl55.exe as the GEM offline?

As far as I know there is only one install.

I will double check.

[Clive Loynes]

Only a single install.

Here are the traces for on-line and off-line.

ON-LINE



OFF_LINE





Both of the above sessions were at a solid 60fps.

[Cookie]

Have you set the Win energy settings to high performance?

I will look it's deep in the settings...

My german version...