i decided to look at it every 5 min on the XMB with the buttons combination of Webman while playing, i played the game trying to drive as fast as i could around the map, crashing into other cars, starting hot pursuits... Though i must admit i stopped every now and then to hide in the garage so that should have affected the test (silly me) i'll test them again when i get the PSU and HDD work done and i'll post them here.
Yeah, thats the point, first you need to "warm up" the whole PS3 by playing normally for at least 30 or 40 minutes. This is considering the PS3 starts from ambient temperature, if we start from ambient are need around 40 minutes for the whole components of the PS3 to reach a temperature that could be considered a bit stable, and inside a game
In the practise the temperatures inside a game are not stables, varies a lot, this is why to make a good test you need to cause some chaos on screen for as long as 2 minutes or more... and in this exact moment you need to look at the temperatures... that should be (if done well) your maximun temperature... and represents a "temperature peak"... are hard to catch because could happen fast, so you need to look temperatures more frequently when doing this to try to catch the "peaks"
I explained all this details mostly for you to get the overall concept just so we all are sure your temperature meassures was correct (in the worst scenario posible), but you dont need to go picky with this right now because as i mentioned the test you made with very fast fan speeds was a good idea and has been useful to know the crashing problems doesnt comes from that
Later when you repair the problem of the crashes you can spend some time making this kind of tests with different games to find the speed settings that fits better for your PS3
Also, what i mentioned before, you need to make another test (starting from ambient temperature) to look at the difference of temperatures in between CELL and RSX... in two enviroments
-When booting the PS3 from ambient temperature ---> to XMB (dont do anything and check temperatures for 20 minutes)
-Ingame (10 or 15 minutes of play should be enought to expose the posible temperature problems)
About the HDD replacement, it is possible to make a backup of my games saves? I ask because when i tried to move a save data to use it in another profile, the games stated the they couldn't use it because it's from another user, will the same happen if i backup my games saves in an external HDD/pendrive and attempt to load them again? In case something goes wrong
If your PS3 has a NOR flash, you can take the hdd out of the PS3 (and reserve it, dont do anything with it)... and replace it temporally by a different hdd
If you do that, at the next boot with the new hdd the PS3 is going to ask you to install the firmware (from PUP), you should install the same firmware you had before replacing the hdd
Then install a backup manager or whatever you use, then run a game (and complete the gamedata/savedata/trophy) installation to the internal hdd... and see if the problem of crashes still happens
If it still happens... then the problem is not related with hdd, so you can replace the hdd by the old one and the PS3 will boot like if nothing happened (no need to reinstall firmware this time, because the old hdd was fine)
About the PSU, i read about the mod you're mentioning, i see that there's a chance to damage the console and even make a fire (of course, i understand that a risk always exist even in the smallest mods) so in which case i should attempt to use this mod?
No risk of that as far i know, the PS3 components are going to take from the power supply the amount of current they needs (not more)
As example, in PS3 slims the power supplies are around 270w iirc but you could replace the power supply by a 700w one from PC, there is no problem with that
The problem of this mod to connect an ATX PSU to a PS3 is because the way how the ON/OFF button works
In a ATX PSU the green wire of the ATX connector needs to be grounded for the power rails to work (that generates the voltages)
In a PS3 we just need 12v and 5v power rails (and another 5v for standby), this ones are easy
But the ON/OFF button of the PS3 doesnt works by grounding it... so is not posible to connect a direct wire from the PS3 ON/OFF button to the green wire of the ATX PSU, i remember to speculate with other people about using a small transistor to bypass this problem, and it should work but nobody made it as far i know
Anyway, this problem with the ON/OFF button is only incase you want to use the ATX PSU permanently attached to the PS3 (some kind of case mod or for using the PS3 motherboard inside a PC chasis)
For you i guess doesnt have importance, because the idea of replacing the PSU of the PS3 by an ATX PSU is just a test to be 100% sure the problem comes from it
I think you can forget about the PS3 ON/OFF button (no connection in between the PS3 ON/OFF button and the ATX PSU) and just turn it ON by grounding the green wire of the ATX PSU