Don't ever2 disable CPU TM function... unless you want to fry your procs...

12V rail for that PSU is actually 32A30A max allowed when combined both rails...
if hardware already accomodates 18A at 12V1 rail and balance capacity for 12V2 is 12A... vice versa...
ie..
12V1 =16A,12V2=14A...
12V1 = 17A, 12V2=13A

This post has been edited by campsol2k: Sep 5 2009, 05:03 AM

Sorry.. i made a mistake earlier. The correct value is 30A.. U can refer to the label on both column "12V1 and 12V2" and row "max combined wattage"... 360W divide by 12V = 30A (Note..power law equation Power=Current X Voltage )...

As 4 your PSU.. Its simple actually.. simple mathematics... nothing to do with physics except the power law....
575W (combined {+12V} + {+3.3V} + {+5V} rails) - 155W (combined {+3.3V} + {+5V} rail) = 420 W capacity@12V rails (equivalent to 35A)

Specifically for your PSU... actually the rails are shared to single transformer (higher wattage/power PSU usually uses more than one transformer.. so different case)... the multi-rail PSU is designed to meet intel ATX PSU spec which limit each +12V rail to 18A for safety reason.... n each rail is routed to specific hardware... ie your PSU has 4 rails...so 12V1 for CPU, 12V3 for HDD, Optical, etc 12V2+12V4 for PCI-E graphics card(s)...

This post has been edited by campsol2k: Sep 5 2009, 09:55 PM

My previous statement

CPU already accommodated *18A @12V1.. so total capacity left @+12V rail is 17A... and that 17A is for the rest of the hardwares @ 12V2, 12V3, 12V4.. if one GC accommodates 7A @ each 12V2 and 12V4 (meaning 2 GCs)... then the current left for the HDDs and optical drives @12V3 is 3A...
the key ingredients to mix and match the +12V rails are.. don't exceed 18A load for each rail.. and dont exceed 35A load for combined rails...

* In reality... CPU doesnt eat that much power... my stock Q9550 eats around 55W~60W and when OCed w/ voltage increment @1.325V is approx 110W (ASUS EPU-6 Engine monitor report) .. and usually max possible power consumption for a CPU is 130W (11A) unless if the CPU is overclocked w/ voltage increment which add another +60W(5A) power consumption for example

This post has been edited by campsol2k: Sep 5 2009, 10:04 PM

Man... your estimation is way out of range...
a bit info just to let u know....
HDD uses +12VDC(for motor) and +5VDC supply rail..
Fans uses +12VDC supply rail
Mobo(SB/NB/etc) uses +5VDC +3.3VDC supply rails


- ATI HD4870 consumes max 180W (1 6-pin PCI-E connector supply upto 75W & PCI-E x16 slot supply upto 75W)... but normally the average power consumption doesnt exceed that number(70%~80% during gaming) ....
- DDR2 consumes estimated 12W on 4 slots (if one stick consumes around 3W).. the DDR3 uses less power than DDR2... DDR > DDR2 > DDR3
- For non-OCed/OCed CPU... the max power consumption is proportional to the increment of clock speed and the supply voltage...
- CPU or some hardwares power consumption varies between load... idle CPU uses less power...
- Your CPU consumes around 30~40W @ stock

ADDED:
Correction... i made a mistake again... i didnt notice that the rail distribution is stated on your PSU label. Most PSUs don't provide this kind of info to users... FSP is generous enough to put them on the their PSU label... so i made my own assumption before.... the actually rail distribution for your PSU ... 12V1 for CPU.. 12V2 for PCI-E GC... 12V3 for hdd/etc.. 12V4 PCI-E GC...

This post has been edited by campsol2k: Sep 5 2009, 10:58 PM

You r on the right track (although some aren't accurate/correct but i think its acceptable for quick estimation)... The estimation u've made is the estimated peak wattage (this estimation helps u determine the right PSU capacity when building a computer) ... its unlikely your computer used that much most of the time because the hardwares power consumption varies between load... average will be estimated 70%~90% of the peak power during load (depends on the type of task ... gaming, etc )....
ie during gaming your hard disk will idle most of the time... CPU n GPU usage don't 100% utilized all the time during gaming... it depends on how efficient the games are coded or which games uses hardware efficiently such as CPU intensive game like GTA4 uses more CPU power than GPU...

Now.. the wattage u estimated is the ideal hardware consumption... but the real power consumption is the power drawn from your AC wall socket ( aka the amount of energy sucks from power utility company)... here the efficiency of a PSU comes into play. Most old PSUs have 70~75% efficiency@ "typical load" (Note: meaning 50% of total PSU capacity is loaded). However, most cap ayam PSUs have below 70% eff. By using 80plus PSUs which they have more than 80% efficiency.. u can save your energy bills...
ie
non 80-plus PSU (70% eff) - the amount of power drawn from socket = 272/0.7 = 388W
80-plus PSU (80% eff) - the amount of power drawn from socket = 272/0.8 = 340W
See the difference?

This post has been edited by campsol2k: Sep 6 2009, 04:36 PM

@JoBigShow
Power Requirement for 4870 CF
http://www.amd.com/us/products/desktop/gra...quirements.aspx

i checked the FSP manual. I believe your PSU's +12v rail is capable handling more than 35A (the 35A is the minimum and the maximum will be around 47A~48A). See at +5v,+3.3v, +12v combined wattage is 575W and minimum +5v & 3.3v(in the manual) is 5W and maximum 155W (on the PSU label) but your PSU label is quite confusing because it doesn't state the maximum combined +12v rail like other PSUs ie Gigabyte PSU we discussed earlier... its +12v rail has 30A max. For safety... 35A is the best assumption...
Your PSU absolutely can handle 4870 CF and still got a few headroom for other hardwares ie HDD... so don't worry...

This post has been edited by campsol2k: Sep 7 2009, 12:46 PM

Ok. Here's the tricky part when selecting a PSU....
some of the reason why ppl recommend such huge amount of wattage because of the amount of native PCI-E connectors that came together when u purchase a PSU.
ie.. when u want to CF 4870... u need 4X 6-pin PCI-E connector... but most PSUs below 700~750W dont provide sufficient connectors...
i don't have any definitive/exact reasons why PSU manufacturers dont provide enough amount of connectors although the total wattage capacity is sufficient to power two ATI HD4870 cards in CF mode... but i believe the answer lies at the PSU design itself... i'm not a PSU engineer or designer. So i only can make my own assumption based on my readings.. and i believe the reason why they do this is because of the railing/design issue ...

My calculation was based on the "minimum load" column under electrical specs table. Don't take for granted what i said earlier... i calculated the max wattage based on my assumption. That's why i can come up with my own assumption of the current range(35A~48A)... Based on my research that i've done... most 600W PSU usually can handle around 40A@12V rail. Take note that... a 600W PSU isnt made the same as other 600W PSU... that's why u saw variety of 600W PSU.. some have multiple rail +12V .. some have single rail +12V... some support large current@+12V rail... some arent...

i forgot to tell u that when u CF 4870 using your PSU.. the 12V rail will be heavily loaded...
ie..
i only take the significant power consuming hardware only
CPU - 40W
2X GC - 360W
Total - 400W max... 20W headroom if we assume your PSU can handle 35A@12V rail...

I hope we don't stray out of topic too long or else the moderator will notice us... it should be inside this thread http://forum.lowyat.net/topic/450882 or http://forum.lowyat.net/topic/376014

This post has been edited by campsol2k: Sep 8 2009, 06:26 AM

Technical term... PL = tRD (static MCH read delay)..
increase the memory read, write and copy bandwith and latency resulting better overall system performance... ie faster OS boot, faster apps loading time, increase games framerate, etc

Formula
Trd (in ns) = PL X (1000/FSB)

This post has been edited by campsol2k: Sep 10 2009, 07:25 AM

Most probably u need to pump more vmch (aka vnb)... detailed explanation on tRD... http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=6
@OC4/3
How old r u? 15?

This post has been edited by campsol2k: Sep 10 2009, 05:39 PM