1. Join Now

    AVForums.com uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Is a 420PSU enough?

Discussion in 'Computer Components' started by Triggaaar, Apr 26, 2005.

  1. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    I've just been on the phone to Scan, going through my spec, and they recommended I went for a 480W PSU instead of the 420W Tagan I was considering (extra £18).

    Is that good advice?

    Case – Casetek 1018SM
    PSU – 420W Tagan Whisper aPFC UltraQuiet 21db £53 (that's what I was planning to buy).
    Mother - Asus A8N-SLi (Standard) Socket 939 nForce 4 PCI-E
    CPU - AMD Athlon 64 3500
    128MB Gigabyte GV NX66T128VP - GF6600GT
    Zalman heatsink - CNPS7000B
    Mem – 1 Gb (2 x 512 Mb) Corsair TwinX-XL
    Floppy
    Hard Disks – 2 * 250Gb Seagate Barracuda (7200.7rpm, 8Mb) - SATA NCQ
    DVD - NEC ND-3520A
    Soundcard - M-Audio Audiophile 2496

    I suppose the extra power could be useful if I ever bought a 2nd GC for SLi?

    PS, since Scan don't do Nexus or SilenX fans, would 2 of these Akasa 120mm fans be suitable?

    Thanks
     
  2. KraGorn

    KraGorn
    Active Member

    Joined:
    Aug 30, 2003
    Messages:
    4,740
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    68
    Location:
    Warrington
    Ratings:
    +27
    I'd have thought 420W should be sufficient, I'm running 5 disks and 2 opticals with a 480W PSU, the graphics is an ATI 9800 Pro which does draw extra power like the 6600 will.

    As for the fans, 18dba is pretty quiet, though I'd augment them with a Fan Mate to allow for fine tuning to eliminate any low level buzzing which even Silenx are prone to.
     
  3. MikeFish

    MikeFish
    Guest

    Products Owned:
    0
    Products Wanted:
    0
    Ratings:
    +0
    Have a look here.
    You can enter all your specs and it wil work out how much power you will need. Think you'll be suprised how little power you actually need. Don't forget, the wattage given will be for all oyur components working at full pelt all at the same time (very unlikely).
     
  4. mjn

    mjn
    Distinguished Member

    Joined:
    May 24, 2001
    Messages:
    17,649
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Herts, England
    Ratings:
    +4,559
    Don't forget to check the ampage of the PSU as well.....as it doesn't make a difference if the PSU is 700W, and the Amps are 10A @ 12v!

    Plus, if you're going to go SLi at any point, get a PSU designed for SLi, such as a OCZ Powerstream 520W.
     
  5. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    Using the calculator, comes out at 364 watts. If I added another graphics card, that would be 441 - although, only with everything running. Not sure how much in practice.

    Not sure what ampage the Tagan's are, but I assume they're both ok.
    Only the 480W Tagan says it's SLi ready, so might be worth getting it, in case adding a 2nd GC is ever a good idea.
     
  6. monkeynuts

    monkeynuts
    Active Member

    Joined:
    May 28, 2002
    Messages:
    1,810
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    51
    Location:
    East Devon
    Ratings:
    +27
    If it's any help i have a 300W nexus running:
    3200+ (400)
    2x256mb
    200gb SATA
    80gb ide
    DVD-RW
    Floppy
    128mb FX5200
    TV card
    Fan controller

    I know it's not similar, but i was worried about 300W not being enough, but it's never strained and the psu fan never changes speed.

    There's some very interesting articles on www.silentpcreview.com about what power is needed and all the PSUs are reviewed as well.

    Sorry if it's a bit off track!
     
  7. monkeynuts

    monkeynuts
    Active Member

    Joined:
    May 28, 2002
    Messages:
    1,810
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    51
    Location:
    East Devon
    Ratings:
    +27
    Oh and Scan seem to be very cheap for the smaller 80mm panaflo fans......
     
  8. mjn

    mjn
    Distinguished Member

    Joined:
    May 24, 2001
    Messages:
    17,649
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Herts, England
    Ratings:
    +4,559
  9. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    Not at all, thanks

    that extreme overclocking forum has some good info, but a bit over my head. Quote from the ex overc site: "Today’s computers, especially the AMD A64’s and the latest Intel P4’s stress the +12V rail the most, requiring far more amperage than was originally called for in the original ATX spec for the +12V rail."
    It also explains Dual +12v rails - I assume the Tagan's aren't Dual +12v rails?
    From the tagan site (thanks for the link mjn) the Tagan 420W has 264 of those Watts, at 12v, 22amps. The Tagan 480W has 336 Watts at 12v, 28amps. To the uneducated (me), seems plenty good enough.

    I'll do a bit more reading in case I go SLi.
     
  10. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    The thread in the extreme overclockers site also says:
    To be recommended to power an AMD A64 system the power supply must: supply a minimum of 24A on the +12V rail(s)
    which the Tagan 420W doesn't quite manage (obviously only in the opinion of that auther)
     
  11. overkill

    overkill
    Well-known Member

    Joined:
    Nov 6, 2003
    Messages:
    11,776
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Murkeyside
    Ratings:
    +1,192
    I would go with the 480 watt PSU as suggested. 420 provides nil overhead, and a lot of that output is still on the 3.3 volt rail. It's the amps and wattage of the 12 and 5 volt that really counts. My wifes PC has a quality 430 watt PSU that struggles with an XP2400, 768mb ram, a bog standard 7,200 80 gb HDD and a gf4 VGa card. And no, it's rails don't dip significantly, and on testing no faults came up. It just can't cope when she uses it for multi tasking using big image files, and media projects which cause heavy CPU (12 volt) load.

    Some people are lucky in that they can get away with a fairly low power PSU. Others aren't. Having seen posts from literally hundreds of people who've stopped random lockups and system crashes by simply upgrading their PSU, it's clearly not an option to skimp on.
     
  12. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    Isn't that overkill?

    Kidding ;)
     
  13. Kopite4Ever

    Kopite4Ever
    Member

    Joined:
    Mar 15, 2004
    Messages:
    4,302
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    71
    Location:
    Liverpool: European Capital of Football 2005/2006
    Ratings:
    +76
    im running a tagan silent 480W PSU not overkill in the slightest. i have similar ish spec to you but my Gfx card is alot more powerhungry and my psu handles it with easy. and its ever so quiet
     
  14. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    My overkill remark was based on the user name of the person who recommended the 480.
     
  15. Kopite4Ever

    Kopite4Ever
    Member

    Joined:
    Mar 15, 2004
    Messages:
    4,302
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    71
    Location:
    Liverpool: European Capital of Football 2005/2006
    Ratings:
    +76
    im not stupid you know. im just giving you my opinion and i just happened to use that word
     
  16. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    Well I've crossed the 420W off my list. If I ever get a 2nd GC for SLi, I'll want more than the 420 (22A on the +12V rail). ANd the 420W isn't described as SLi ready. And although the 480W Tagan is, it seems to only have 1 SLi connector (to power the Gcard) although I could be wrong here.

    From mjn's link: and.... what about TAGAN ? I like my Tagan 480W
    Good quality, not good enough for "Premium choices."
    If new egg had it priced lower, it might be a "Bang for the Buck."

    A recommended option, that's available at scan (I'd be happy to buy elsewhere, but that would add to shipping costs) is the 600W Enermax Noisetaker. Costs £99, but would be more future proof (2 +12v rails, 2 SLi connectors & recommended by nVidea)
     
  17. mjn

    mjn
    Distinguished Member

    Joined:
    May 24, 2001
    Messages:
    17,649
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    166
    Location:
    Herts, England
    Ratings:
    +4,559
    and you thought the choice of PSU was pretty easy..."how many watts do i need?" :)
     
  18. overkill

    overkill
    Well-known Member

    Joined:
    Nov 6, 2003
    Messages:
    11,776
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Murkeyside
    Ratings:
    +1,192
    Enermax are, in particular as Antec's QC seems to have dipped recently, the top mainstream PSU makers. The noisetakers are eerily quiet, while at the high end they have plenty of grunt and split 12 volt rails. If you're serious about the 600 watt version keep an eye here :- noisetaker. However, the users on ebay aren't that savvy price wise, so it may end up being too close to retail to bother with anyway.

    A 600 watt PSU is pretty hefty for current needs, but with bigger and faster CPU's and VGA cards arriving all the time......... If it has all the right leads, and enough of them, and you have the budget, why not? You won't have to worry about it again for years.

    Tagan is a new name on the market, and gets good reviews. But, many of these reviews aren't lab tested, so check for ones that test the voltage properly. One or two of those that I've seen were less enthused. On the flip side the majority of users seem happy with them, and (unlike some other PSU makers!) we haven't heard any horror stories.

    Triggaar and bauer, don't take the username in vain! :nono:





    :D
     
  19. Triggaaar

    Triggaaar
    Well-known Member

    Joined:
    Apr 13, 2003
    Messages:
    5,494
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    133
    Ratings:
    +1,012
    At least we spelt your user name correctly :p
     
  20. overkill

    overkill
    Well-known Member

    Joined:
    Nov 6, 2003
    Messages:
    11,776
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Murkeyside
    Ratings:
    +1,192
    :D
     

Share This Page

Loading...