I have an Antec SP450 atx power supply in my PC and was very weak in the 3.3v line
the motherboard was reporting 3.1 v even sometimes the voltage dropped to 3.0v when I use my TV card or playing games
My PC is very power-hungry it have a core i5 95w,geforce GTX 560 (75w ), soundblaster X-FI ,TV card etc
OK trying to solve this I remember this power supply originally had on the 3.3 v rail comes with a fujityu 3300 uf buggy cap which I replaced with a rubycon 3300 mbz series
Then to solve the weakness in the 3.3v line the first step I did was removing the 3300 rubycon cap for a 4700uf chemicon KZE
now the voltage of the 3.3 v line was worst than before dropped to 3.0v even to 2.9v
Then automatically I estimated was so capacitance for such 3.3v line which my power supply couldn't handle
so I replaced the 4700uf cap by a 2200 uf chemicon KZE and voltage raised to 3.2v and I was surprised but yet nor very happy with the results I replaced the 2200uf cap by a 1500 uf rubycon MBZ
and yes...now the result is 3.27 v which is very good...yet it dropped to 3.2v on stressing the computer anyways this very good compared to using a 3300 uf cap
Resuming here is the capacitance/voltage comparison ratio in the 3.3v rail
4700 uf > 3.0 v
3300 uf > 3.1 v
2200 uf > 3.2 v
1500 uf > almost 3.3 v
conclusions:
1:the more capacitance the more ripple but the less voltage
2:sometimes you need to low the original capacitance in 3.3v rail to get descent voltage (maybe this apply to 5v rail as well)
the motherboard was reporting 3.1 v even sometimes the voltage dropped to 3.0v when I use my TV card or playing games
My PC is very power-hungry it have a core i5 95w,geforce GTX 560 (75w ), soundblaster X-FI ,TV card etc
OK trying to solve this I remember this power supply originally had on the 3.3 v rail comes with a fujityu 3300 uf buggy cap which I replaced with a rubycon 3300 mbz series
Then to solve the weakness in the 3.3v line the first step I did was removing the 3300 rubycon cap for a 4700uf chemicon KZE
now the voltage of the 3.3 v line was worst than before dropped to 3.0v even to 2.9v
Then automatically I estimated was so capacitance for such 3.3v line which my power supply couldn't handle
so I replaced the 4700uf cap by a 2200 uf chemicon KZE and voltage raised to 3.2v and I was surprised but yet nor very happy with the results I replaced the 2200uf cap by a 1500 uf rubycon MBZ
and yes...now the result is 3.27 v which is very good...yet it dropped to 3.2v on stressing the computer anyways this very good compared to using a 3300 uf cap
Resuming here is the capacitance/voltage comparison ratio in the 3.3v rail
4700 uf > 3.0 v
3300 uf > 3.1 v
2200 uf > 3.2 v
1500 uf > almost 3.3 v
conclusions:
1:the more capacitance the more ripple but the less voltage
2:sometimes you need to low the original capacitance in 3.3v rail to get descent voltage (maybe this apply to 5v rail as well)
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