Hi everyone.
As i said before, i have done some testing over the weekend. i decided to take the "yard condition" slim (65nm, 2004B, dyn001) that was overclocked to 750/925 with stock voltage because i thought that the potential would be the biggest at this particular one.
Spoiler: it is not.
First i had to find out whats the stock voltage (dont have my multimeter here..), so i began to start with 0,96v. Console booted, but no picture. there is only one conclusion: its undervolted. i went higher and higher until the core stabilizes and found out that 1,1v has to be the stock voltage. so now i had a reference and knew from my experience, how far i can go as i do have some older experiences from my curie graphic cards. i decided to test core frequency first, so i built a 800/900 and flashed it. i raised voltage to 1,15v (took the value for 1,165v as there are some losses due to efficiency) and it stabilized with 800/900. tested Crysis 3 and some other games and everything was running fine, no artifacts, no crashes. i was pretty positive and sure it will take a lot, so i next tested 850/900.
First boot: freeze in xmb. i raised voltage to 1,2v. still freezes, but a little bit later. so i raised voltage again to 1,22v but still kept freezing in xmb. at this point i knew, that this is gonna be a tough one as that is way too much volts for that low frequency. i knew it wouldnt help to push voltage higher, but i did. raised it again to 1,25v. still freezing. at this point it was absolutely clear, that the rsx cant take that much voltage and stabilize. i set fanspeed at 100% in fantable and as everbody expected, it didnt freeze in xmb instantly anymore. i tried to start a game, but it froze. of course it did. i raised voltage to 1,28v, but nope, it turned of with 3 beeps when a game is started. errlog says 1002 but thats what i expected. Tokins are worn out and cant provide that much power any longer.
yep, thats a bummer. GPU started so insanely high with stock voltages but just lets me add another 50 mhz...
alright. i went back to 800 core as it seems to be the maximum that chip can handle.
but... what about vram? maybe i got some more luck there. i put a 800/950 on and lowered voltage to 1,25v and yep, it boots. tested crysis 3 again for 30 minutes with 50% fanspeed and gpu temperature was at 65 Celsius. Everything was fine. so i decided to push it further. 800/975 was next. and again it perfectly boots and runs stable in crysis 3. now i had a goal. i wanted a 4 digit vram clock and flashed 800/1000. nothing special to say, it runs.
so i tested crysis 3, farcry 3 and gta 4. it does a great job. performance is very decent and there is no flickering/texture warping or artifacts. temperatures seem fine and thats what they have to be. [notice the word "cell" in that crysis scene, maybe its a little foreshadowing whats going to be overclocked next?lol]
if temps exceed 70 C it starts with artifacts but it wont crash. i decided to stop here even though i am very sure i could raise vram to 1050. but at this point its not necessary as it is way more than some of you would expect from a 65nm rsx.
whats the conclusion and what do we learn from that?
there are many things i can confirm:
1) yes, chips do have to run on low temps. 70C seems to be a magical border at slim consoles. sweet spot is 60-65 C.
2) yes, 65nm seem to be not the best choice for overclocking as they only can handle poor core frequencies
3) no, its absolutely wrong that they cant go over 650 core. "none of them can", but mine do obviously. even with stock voltages. they dont go high, thats correct. but they can definitely do 700 or in some cases 750.
4) yep, it looks like at least some of them can reach crazy vram speeds, as mine does easily 1ghz.
5) and last thing: there has to be a difference between 65nm slim and 65nm fats, as i have never seen such crazy vram speeds on fat 65nm fabs. my 65nm fat does struggle with 650core and 850 vram, but i think we need to get more data here. maybe my fat is an unlucky one, but i dont think so.
GPU: rsx65 a06 800/1000 vpe:ff shd:3f [K4A023000:1:2:15:b:3:3:8:1][3d:0:2:0:1:2:0][2:1:0]
Errlog:
Firmware Version: 4.90 (build 50747)
Platform ID: ÿÿÿÿÿÿþ›
Product Code: 00 85
Product Sub Code: 00 09
Hardware Config: 000000000203BC3C
Syscon Firmware Version: 0832.00000000083E0832 (EEPROM: 00000000083E0832)
Bringup Count: 5766, Shutdown Count: 5025
Runtime: 365 Days, 15 Hours, 31 Minutes, 14 Seconds
Error Log
01: FFFFFFFF Sat Jan 1 01:59:59 2000
02: FFFFFFFF Sat Jan 1 01:59:59 2000
03: FFFFFFFF Sat Jan 1 01:59:59 2000
04: FFFFFFFF Sat Jan 1 01:59:59 2000
05: FFFFFFFF Sat Jan 1 01:59:59 2000
06: FFFFFFFF Sat Jan 1 01:59:59 2000
07: FFFFFFFF Sat Jan 1 01:59:59 2000
08: FFFFFFFF Sat Jan 1 01:59:59 2000
09: FFFFFFFF Sat Jan 1 01:59:59 2000
10: FFFFFFFF Sat Jan 1 01:59:59 2000
11: FFFFFFFF Sat Jan 1 01:59:59 2000
12: FFFFFFFF Sat Jan 1 01:59:59 2000
13: FFFFFFFF Sat Jan 1 01:59:59 2000
14: FFFFFFFF Sat Jan 1 01:59:59 2000
15: FFFFFFFF Sat Jan 1 01:59:59 2000
16: FFFFFFFF Sat Jan 1 01:59:59 2000
17: FFFFFFFF Sat Jan 1 01:59:59 2000
18: FFFFFFFF Sat Jan 1 01:59:59 2000
19: FFFFFFFF Sat Jan 1 01:59:59 2000
20: FFFFFFFF Sat Jan 1 01:59:59 2000
21: FFFFFFFF Sat Jan 1 01:59:59 2000
22: FFFFFFFF Sat Jan 1 01:59:59 2000
23: FFFFFFFF Sat Jan 1 01:59:59 2000
24: FFFFFFFF Sat Jan 1 01:59:59 2000
25: FFFFFFFF Sat Jan 1 01:59:59 2000
26: FFFFFFFF Sat Jan 1 01:59:59 2000
27: FFFFFFFF Sat Jan 1 01:59:59 2000
28: FFFFFFFF Sat Jan 1 01:59:59 2000
29: FFFFFFFF Sat Jan 1 01:59:59 2000
30: FFFFFFFF Sat Jan 1 01:59:59 2000
31: FFFFFFFF Sat Jan 1 01:59:59 2000
32: FFFFFFFF Sat Jan 1 01:59:59 2000
i am thinking about desoldering the tokins and start a new test with tantalizers. i dont have much hope there as voltage is already too high for such poor frequency. im pretty sure i shouldnt go over 1,3v Vcore...
thanks for reading and i hope i could help.
to be continued...
//Part 2
I was hustlin' to achieve more. i wanted to squeeze every last mhz out of my slim, so i had to focus on the problem with the occuring 801002 error when putting load on the system next. i was pretty confident that my nec/tokins have aged significantly due to nearly 9000 hours of runtime. I decided to remove the bottomside tokins and throw some original sony tantalizers on (from a donor board). First i soldered some mixed 470µF & 330µF caps on it ( yeah i know mixing capacitors doesnt work out well). Just had these on my hands and i was only supposed to see if it instantly crashes again at 1.28v.
Of course, it did. i guess this is my personal pitfall. but coming to pitfalls, i remembered RIP-Felix's words about capacitance so i gave it another shot. i was thinking about the best configuration and decided to put a 2x3 330µF pattern on it. i bridged them together to make impedance as low as possible and came to 1980µF at total whats exactly the value of one tokin. so capacitance isnt the issue anymore.
now it has to work. tried 1.28v again and it runs fine in xmb. starting a game works either, but after about 20mins it shuts off and flashes red. cool. at least i could make it last longer, so i was pointing at the right problem. after this im sure that i have to get rid of every tokin. i have to do the upper side. i am so close to get it running with 850 core. its not just achieving a goal, it is troubleshooting at its best. it would be another confirmation that the whole VRM assembly seems to be a huge bottleneck. so my journey isnt over yet.