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Video Card/Power Supply/Case Compatibility

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August 14, 2010 2:12:56 AM

Hello,
I recently bought a ATI Radeon HD 5770 card for my rig to replace the old HD 4350 in my system. But it looks like I overlooked something with the power supply connectors. The PSU that came with my case doesn't seem to have the right connectors. I would appreciate some help figuring out where I went wrong and picking any new parts I need to make this work, I really want to hold on to this card. Sorry if my grammar is bad, very tired and will repost in the morning lol. Here are my pc specs.

NZXT TRINITY BLK Black/Silver SECC Steel ATX Mid Tower Computer Case 400 WATT PS2 ATX12V Power Supply

Gigabyte AM2 GA-M55SLI-S4

I'm hoping I can find a supply that works with the new card and my motherboard btw
a c 139 ) Power supply
August 14, 2010 3:07:22 AM

Hello strangerdanger_02;

Did you get a molex to PCI-e power adapter like this one in your HD 5770 video card accessory pack?

You plug in two 4 pin molex connectors from the PSU into the adapter and then plug the six pin connector into the video card
and you have enough power to run the HD 5770.
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a c 139 ) Power supply
August 14, 2010 3:10:46 AM

Here is a HD 5770 and it's accessory pack. It has a molex to PCI-e adapter that looks like it might use one molex 4 pin connector.
The adapter is in the lower left of the picture.

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a c 139 ) Power supply
August 14, 2010 3:32:31 AM

DANGER strangerdanger_02;

That PSU in your NZXT TRINITY may not have enough power for your system with the HD 5770 installed.
If I manged to track down the correct PSU your Casing Macrom MPT 400 PSU is unusually weak in the +12v power rail.

A 'usually reliable source' over @ Guru3D ([WIP] ATX PSU Maximum Combined 12v Ratings) is saying that Casing Macron MPT-400 has ~15Amps +12v power.
I expect you to have problems running that HD 5770 without replacing your PSU. Sorry.



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August 15, 2010 12:05:43 AM

WR2 said:
DANGER strangerdanger_02;

That PSU in your NZXT TRINITY may not have enough power for your system with the HD 5770 installed.
If I manged to track down the correct PSU your Casing Macrom MPT 400 PSU is unusually weak in the +12v power rail.

A 'usually reliable source' over @ Guru3D ([WIP] ATX PSU Maximum Combined 12v Ratings) is saying that Casing Macron MPT-400 has ~15Amps +12v power.
I expect you to have problems running that HD 5770 without replacing your PSU. Sorry.
http://images17.newegg.com/is/image/newegg/11-146-015-S12?$S640$

WR2, I'm not surprised that you think it won't be enough power wise, and I don't seem to have the right connectors anyway.
And yes, my card did come with an adapter that I plugged into both 4 pin female ends from my PSU, but it did not seem to power up at all. Wrong connectors or simply not enough power??

Could anyone suggest a good power supply then? As long as it can fit in my case and has the right connectors for the rest of my components (and enough power for the new card of course) I would appreciate it
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August 15, 2010 12:20:51 AM

WR2 said:
I have to think it just wasn't enough power.

For comparsion - here is a 'real' 400W PSU Corsair 400CX $50 before $20 rebate
Corsair 400CX review @ Hardware Secrets 'Golden Award'
It has 30Amps of +12v power and its known to handle the HD 5770s well.
http://images17.newegg.com/is/image/newegg/17-139-008-S05?$S640W$

I was actually looking at this PSU earlier but unless I'm misunderstanding something, that psu's main connector is 20+4 pin
and my mobo needs a 24 pin
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a c 139 ) Power supply
August 15, 2010 12:27:25 AM

A 20+4 connector will fit either 20pin or 24 pin motherboards. You'd be good to go.

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August 15, 2010 12:32:09 AM

WR2 said:
A 20+4 connector will fit either 20pin or 24 pin motherboards. You'd be good to go.

http://images17.newegg.com/is/image/newegg/17-139-005-S05?$S640W$

I'll give this one a shot then, thanks a bunch. You say this paticular psu does well with the 5770 even with 400w output correct?
And it should come with all the connectors I need for the rest of my components (dvd-rw drive, hard drive, extra side panel fan with LED)
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a c 139 ) Power supply
August 15, 2010 12:38:22 AM

Yes, it has you covered for all of that. Including a real 6-pin PCI-e connector for the video card.
With that 30amps of +12v it actually have more of the right power that a CPU and video card need than some budgety 500W PSUs.


Here is a 500W PSU with just 28Amps (maybe!) of +12v power.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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August 15, 2010 12:40:20 AM

Well that settles it then. I'll give this new PSU a whirl. Thank you for your help and time, I'd love to let you know how it goes.
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a c 139 ) Power supply
August 15, 2010 12:46:04 AM

It always helps the next guy when we can tell him someone else did the same type of thing and had success,
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August 19, 2010 12:25:14 AM

WR2 said:
It always helps the next guy when we can tell him someone else did the same type of thing and had success,

I installed the new power supply and the 5770 definetly has power and starts up but the system will not boot up at all now, I just get a blank screen. BUT when I tried to start it up with the old card (I thought I had to unistall the old drivers to get it to bootup) I got a new error message at the bootup screen. A CMOS checksum error? Something about my SATA HDD?

Theres no way the new card could be sucking to much power that the HDD can't boot is there? The only other thing I can think of is that I forgot to plug the plug from the hdd to the mobo back in at first before I tried to turn it on for the first time.
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