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just bought a power color x1900 xtx, uh oh 30a on the 12v rail

A2Z said:
it says 12V2 is 15A, what does this mean?

and is it ok for my card? :o
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It means the same as before, the other rail can get to 15A. Get the make/model the combined 12v wattage and a list of components with clocks and I can estimate the load.
 
fornowagain said:
It means the same as before, the other rail can get to 15A. Get the make/model the combined 12v wattage and a list of components with clocks and I can estimate the load.
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ok, its an akasa ak-p400fg bl 400W

from here it said total is 372W for my system (winnie [email protected], 2gb ram, asus a8n-sli, 3 SATA HD's, audigy 2 ZS, DVD-RW, soon-to-be x1800XT @ 700/1700

will my 400W psu be ok? or is it cutting it a bit too tight? and the amp thing is ok?
 
A2Z said:
ok, its an akasa ak-p400fg bl 400W

from here it said total is 372W for my system (winnie [email protected], 2gb ram, asus a8n-sli, 3 SATA HD's, audigy 2 ZS, DVD-RW, soon-to-be x1800XT @ 700/1700

will my 400W psu be ok? or is it cutting it a bit too tight? and the amp thing is ok?
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Personally, I always believed in '10% spare rule'.....but nothing scientific - although you could argue that the 400w is peak/max output.....and thus close to the wire.

My advice would be try it and see - run a suite of benchies....but have contingency plan of replacement PSU, perhaps ;)
 
From what I can find, it supplies about 25A at 12v. The CPU+XT are going to use about 18A full load. 3 sata's 1.5A@12v, DVD 2A@12v. MB 3A@12V Add a fan and your just about at the maximum of the PSU. But they don't pull all at once, 80% is a fair guess. Its very close, but should run it. Check the voltages at stock then wind it up and see what happens to the outputs.
 
fornowagain said:
From what I can find, it supplies about 25A at 12v. The CPU+XT are going to use about 18A full load. 3 sata's 1.5A@12v, DVD 2A@12v. MB 3A@12V Add a fan and your just about at the maximum of the PSU. But they don't pull all at once, 80% is a fair guess. Its very close, but should run it. Check the voltages at stock then wind it up and see what happens to the outputs.
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ok thanks for all the info, can you just explain which voltages to check at stock(i assume you mean the gfx card by stock?) and how? how do i check the amp output of the PSU?
 
AceCard said:
a human can take 100v+, thats why usa/japan etc have that standard.

we are behind over here with 240v and all.

i used to work for a building merchant who hired tools all the time, and its well known in that particular industry that 110v is the safer option(and more expensive).
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The reason for the 110 volts is so you use a transformer which is center tapped. Thats why its so safe not cause its 110 volts
 
fornowagain said:
Watch the three voltages with the CPU+Graphics under load with a multimeter.
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There's no point worrying about using a multimeter, it's perfectly safe, just like there's no point going by the readings for rails/vcore/vdimm/anything else in the bios/windows as they're both usually wrong. :p

You can buy a cheap DMM from B&Q for £10, which will do the job fine. Every overclocker should have one.
 
Kesnel said:
Every overclocker should have one.
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Essential I would say. :D

A2Z said:
ok thanks for all the info, can you just explain which voltages to check at stock(i assume you mean the gfx card by stock?) and how? how do i check the amp output of the PSU?
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For those that don't know how. Use the DMM Like this. Set to voltage DC 20V range. You can measure at the MB headers, molex or PCI-e connectors. You may see slightly different 12v readings depending on which rail your measuring.

Multimeter > MB header > Slide black Probe down the back of any black wires.

Red probe to these gives:

Any Orange = 3.3v
Any red = 5.0v
Any yellow = 12.0v

ATX Power supplies are supposed to stay within -+ 5% of nominal. Personally I'd want them a lot tighter than than that.

So the ranges are.

3.14/3.47
4.75/5.25
11.4/12.6

The main things to look for are fluctuations in the 0.1v volt range. The 0.01v range will move all over the place, that's normal. But if its say, 0.2v up/down under light load = unstable. The other thing is voltage droop, usually 12v and an indication of overload. Look at the off load figure, put on full load. It shouldn't drop below the 5% ranges. Again IMO a droop of more than 0.4v@12v is to much.

Once you know a bit more about what to measure you can find reference points on cards to check core and memory voltages. This is for the more experienced because then you can cause damage if you touch/short the wrong thing.



Then your all set for vmods :eek:
 
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fornowagain said:
snip
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lol wow, ok, firstly whats a DMM?

secondly, i have asus probe, and it has votlages as this, with my current 6600GT, not the x1800xt i will get soon.

12V=11.584
5V=4.945
3.3V=3.28

so do i just check this with my new card, and make sure the actual voltages are in the +-5%?
 
well i originally bought for my sapphire 1800xt 256mb :-

Antec NeoHE 550W Modular ATX2.0 PSU (CA-046-AN)
We’ve earned a stellar reputation for producing stable, reliable, industrial-grade PC power supplies. Install NeoHE in your own system, and you’ll understand why. You see, NeoHE packs an impressive array of features—an advanced cable-management system, full ATX12V v2.0 compliance, native support for top end PCI Express Graphics cards, unparalleled power efficiency, universal power input and much more—that allow it to deliver 550 Watts of supremely stable, reassuringly reliable, and virtually silent power.

- Advanced Cable Management System
- ATX12V v2.0
- Universal input automatically accepts line voltages from 100V to 240V AC
- Active PFC delivers environmentally-friendlier power
- Dual +12V rails provide plenty of juice for even the most power-hungry systems
- Includes special power connector for PCI Express graphic cards
- Dedicated circuits for each voltage output allow NeoHE to overcome combined-output limitations
- Voltage-feedback circuitry improves system stability by delivering extremely accurate power
- Temperature-response system ensures blissfully quiet operation
- Dedicated Fan-Only connectors allow NeoHE to control case fan speeds
- Over-temp and over-current protection, provide maximum reliability
- SATA connectors for your Serial ATA drives
- Low Speed 80mm fan delivers whisper-quiet cooling
- Gold-plated connectors for superior conductivity




Price: £68.95 (£81.02 Including VAT at 17.5%)


and my card is UNDERCLOCKING by 50 mhz . after various tests of mobo and card . overclockers said try a different power supply.

which is all well and good . but you read that description and tell me that the psu doesn't look good enough :mad:

so they recommend :-

Tagan TG530-U15 530W ATX2.01 Easycon SLi Compliant Modular Silent PSU (CA-008-TG)
Tagan give us their latest modular power supply. The cable management system allows users to keep their cases tidy while still allowing plenty of flexibility. All connectors are gold-plated for best performance transmission between the PSU and components. Through the exclusively developed TSCT (Tagan Silence Control Technology), fans are maintained at a speed optimised to maximise cooling whilst keeping noise to a minimum.

- Flexible cable management to optimize the space and airflow of the PC case
- Two separate +12V rails for best performance and universal support for all ATX standards.
- Transformable mainboard connectors for PC & Server
- Two EMI-shielded power connectors for PCI Express & VGA graphic cards
- Four Serial ATA power connectors for SATA hard disks
- 120 mm fan for whisper quiet operation
- 3yrs Manufacturer Warranty

Important Information - Direct RMA Service on Tagan Power Supplies - On top of the of all the exciting new features that our Tagan PSU''s introduced, Tagan is committed in bringing the product support services to the next level by launching a new initiative called Direct RMA Request services to OcUK Tagan Customers. Therefore all warranty claims including returns and replacement are handled direct by Tagan.
RMA Procedure - This service is available via email and if you have a faulty Tagan PSU you email [email protected] who will arrange RMA for faulty PSU only and ship you a replacement identical product.


Full Specification

Price: £61.95 (£72.79 Including VAT at 17.5%)


lol which is less power. BUT they did say if that didn't work i could have a refund on that product.. shame i could have had one on the first psu. they said " you should have done your research " which sounds like a lame cop-out to me.

i went by the descriptive text of the product ( plus the fairly hefty price ) as i've no clue when it comes to psu's.

i think ocuk is at least in part to blame, but what can i do ??? :(
 
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A2Z said:
lol wow, ok, firstly whats a DMM?

secondly, i have asus probe, and it has votlages as this, with my current 6600GT, not the x1800xt i will get soon.

12V=11.584
5V=4.945
3.3V=3.28

so do i just check this with my new card, and make sure the actual voltages are in the +-5%?
Click to expand...
Sorry tech speak, Digital MultiMeter

You can't be sure the software monitor is correct, they can be miles out. But the 12v you give there looks low.
 
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