PS3 PS3 Partial BC vs Hardware BC usage of ps3 processors?

[Nate5017]

The Partial BC PS3 uses the cell in conjunction with the PS2's GPU, this is taxing on the system and to further complicate things you cant see the ps3 temperature within ps2 disk games, to compensate for this WebMan will allow you to have a fan speed preset for PS2 games to stop overheating.

However, the hardware BC PS3 has both the PS2 CPU and GPU, so I assume very little work is done on the PS3 hardware itself? apart from upscaling and smoothing of course?

If what I'm saying is right, would a fan speed that keeps me below 60C in idle be suitable for playing PS2 games on a fully BC unit?

Thanks in advance!

 

[Nate5017]

Basically I'm wondering if 40% fan speed (recommended my WebMan) is necessary for a fully backwards compatible PS3 running PS2 games or if the inclusion of both PS2 processors instead of the 1 in the European model means less heat generated from the full hardware BC compared to the partial BC (which would require extra cooling because of the use of the cell).

Also, I would assume that PS2 Classics that require no PS2 hardware would be the most taxing on PS3 hardware, with the classics you can also see the PS3 temperature, so if the partial and fully BC units lighten the load on the PS3 processors it would seem that whatever fan speed kept the PS3 beneath 60C in classics would be more than adequate for PS2 games on BC systems?

 

[Naked_Snake1995]

That is true, Partial or Hybrid Backwards Compatible rely on the CELL+XDR RAM to replace and rework the missing EE+EDO RAM, but it isn't bad as you think, the CELL workload on the PlayStation2 Software is pretty minimal, the CELL doesn't excede 55°Cs under PS2 Mode on my CECHC04, now the RSX is a different story, something in between 59/61°Cs due to the Upscaling/Smoothing and that is at 29% Fan Speed.

The CECHA/B are no different, even through it has a Partial Complete PlayStation2 Hardware, the CELL is still under constant workload, even though it doesn't do nothing on the PS2 Side, of course the RSX still has to do the Upscaling/Smoothing workload, but generally speaking i saw A01s and B01s hovering at a much higher temperatures than my C04, and thoes machines were delided and repasted at fan speeds around 40% close to a toasty 70°Cs on the CELL and the RSX, in theory the A01s and B01s should be much cooler on the PS2 Side, but in actuality the C03/04s and E01s take the lead, but that also depends on how well you've taken care of your machine.

Sent from my G8141 using Tapatalk

 

[Nate5017]

That is true, Partial or Hybrid Backwards Compatible rely on the CELL+XDR RAM to replace and rework the missing EE+EDO RAM, but it isn't bad as you think, the CELL workload on the PlayStation2 Software is pretty minimal, the CELL doesn't excede 55°Cs under PS2 Mode on my CECHC04, now the RSX is a different story, something in between 59/61°Cs due to the Upscaling/Smoothing and that is at 29% Fan Speed.

The CECHA/B are no different, even through it has a Partial Complete PlayStation2 Hardware, the CELL is still under constant workload, even though it doesn't do nothing on the PS2 Side, of course the RSX still has to do the Upscaling/Smoothing workload, but generally speaking i saw A01s and B01s hovering at a much higher temperatures than my C04, and thoes machines were delided and repasted at fan speeds around 40% close to a toasty 70°Cs on the CELL and the RSX, in theory the A01s and B01s should be much cooler on the PS2 Side, but in actuality the C03/04s and E01s take the lead, but that also depends on how well you've taken care of your machine.

Sent from my G8141 using Tapatalk

Thanks for the detailed reply, I'm curious how you can see the temperature in PS2 games, or do you check as soon as you exit to XMB?

 

[sandungas]

The workload in CELL in a full BC PS3 model should be very small, just to throw some rought numbers, something around 20%
In partial BC PS3 models the PS3 CELL processor needs to "translate" the instructions of the emulated PS2 EE processor (and i guess something more) but i guess this workload should be small, lets say around 25%
And when using the (netemu) PS2 emulation made 100% by software the CELL should be almost full workload, lets say 85%+ because every SPU of the CELL is "emulating" different hardware components of the PS2... so the whole CELL (and all his SPU's) are active... and most probably some of the SPU's are over 95%+ workload (this is when netemu starts crawling)

But to get a better idea of the heat generated you need to consider also the manufactuing technoogy used in the different PS3 models, at the same workload the CELL and RSX of the first PS3 models are hotter than the others
Also, keep in mind the PS2 hardware components generates is own heat too... they was reducing the CELL heat but is like moving the heat to a different component of the motherboard