GBAII++ low performance

lioneer · 30 November 2021, 18:21

Hello friends, i am new owner of RTG card GBAII++ (Cirrus Logic ZorroII). But on my A4000, every software or games are slow like on AGA. Shapeshifter, ADoom (9fps on AGA, same 9fps with rtg p96 mode). So i dont know, where is
problem? Or the ZorroII card is slow like AGA chipset?... Thank you

Daedalus · 30 November 2021, 20:55

Zorro-II has pretty limited bandwidth - less than AGA. The main advantage of RTG is the lack of a chunky-to-planar conversion, but any benefits you get from not needing to do that conversion are most likely negated by the bottleneck of the Zorro-II bus. Games like Doom, where the entire screen has to be drawn every frame, are very bandwidth-intensive - you'll notice a much more significant improvement in performance on a Workbench screen or an application screen, for example, where most of the screen is static and 2D operations like line drawing and filling can be done by the graphics card.

utri007 · 30 November 2021, 22:47

You have Amiga 4000 you should get gfx card which supports Zorro III.

Zorro II bandwidth is 3.8mb/s, when AGA has 4.5mb/s.

Benefit to havin gfx card with Zorro II is to get decent resolutions and colors.

lioneer · 01 December 2021, 22:16

yes yes, thank you for answers

30 November 2021, 18:21	#1
lioneer Registered User Join Date: Jul 2021 Location: Ostrava Posts: 58	GBAII++ low performance Hello friends, i am new owner of RTG card GBAII++ (Cirrus Logic ZorroII). But on my A4000, every software or games are slow like on AGA. Shapeshifter, ADoom (9fps on AGA, same 9fps with rtg p96 mode). So i dont know, where is problem? Or the ZorroII card is slow like AGA chipset?... Thank you

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Picasso 96 / GBAII++ issues	wazza	support.Hardware	21	26 November 2021 16:45
Max Performance	momohk	support.WinUAE	10	21 January 2016 11:54
Getting more performance out of my A1200	Devlin	support.Hardware	4	18 December 2013 18:17
PSPUAE Performance	tonyyeb	support.OtherUAE	73	27 January 2011 16:45
How do I get the best WB performance?	Rabbit80	support.Apps	27	01 July 2009 11:29

30 November 2021, 20:55	#2
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,334	Zorro-II has pretty limited bandwidth - less than AGA. The main advantage of RTG is the lack of a chunky-to-planar conversion, but any benefits you get from not needing to do that conversion are most likely negated by the bottleneck of the Zorro-II bus. Games like Doom, where the entire screen has to be drawn every frame, are very bandwidth-intensive - you'll notice a much more significant improvement in performance on a Workbench screen or an application screen, for example, where most of the screen is static and 2D operations like line drawing and filling can be done by the graphics card.

30 November 2021, 22:47	#3
utri007 mä vaan Join Date: Nov 2001 Location: Finland Posts: 1,653	You have Amiga 4000 you should get gfx card which supports Zorro III. Zorro II bandwidth is 3.8mb/s, when AGA has 4.5mb/s. Benefit to havin gfx card with Zorro II is to get decent resolutions and colors.

01 December 2021, 22:16	#4
lioneer Registered User Join Date: Jul 2021 Location: Ostrava Posts: 58	yes yes, thank you for answers

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)