Do I need to / should I upgrade my PSU ( HP z420 )

[xiwiwix]

I have a Zumax X4 ZU-750 (from '07 '08) (dual 12v rails) specs here:

http://www.compsource.com/pn/ZU750W/Topower-4791/


I'll be adding it to my HP z420 (got it CRAZY cheap off a lease), when the 24 - 18 pin adapter from moddiy arrives:

http://www.moddiy.com/products/24%252dPin-to-18%252dPin-ATX-Cable-Adapter-for-for-HP-Z420%7B47%7DZ620-Workstation.html


The existing power supply can handle a Quadro K6000 (600w 90% eff.). It was an option from HP. Specs here:

https://www.itcreations.com/images/products/large/623193-001_2.jpg


PDF which shows projected power consumption w/stock PSU (without quotes search "Intel Xeon E5-1650 (Six-Core)" and it will take you directly to it):

http://www8.hp.com/h20195/v2/getpdf.aspx/c04111039.pdf?ver=21


HP z420 system before any upgrades:

16gb ecc unbuf 4x4gb
E5-1650v0
EVO 850 500gb
NVS 310
(Mother block date 2011)


Upgrades:

HD 6950 (today w/stock PSU)
PNY Potima 240gb (today w/stock PSU)
Seagate 1TB 7200rpm (today w/stock PSU)
Firewire Card (today w/stock PSU needed for Saffire 56)
16gb maybe 32gb RAM (in a few weeks or so)
GTX 770 or 970 (in a few weeks or so)


USB + Firewire add-ons (adding today):

two USB 2.0 external HDD's
two USB 3.0 external HDD's
Astro MixAmp (for gaming)
Crap Keyboard
Razer Deathadder Mouse
Razer Tartaus Pad
Various Midi Input Devices (keyboard, drum module, etc.. not at the same time max 2)
Focusrite Liquid Saffire 56 (recording interface Firewire, not used simultaneous with MixAmp)


Info on my Zumax X4 ZU-750:

The Zumax X4 ZU-750 handles everything in my current system like a boss. All the USB + Firewire units listed above. I'm pretty much salvaging anything and everything I can from my old system and slapping it into the HP z420.



Questions:

Would the stock PSU (HP 623193-001) be enough to handle everything I want to throw at it today?

Will the Zumax x4 Zu-750 handle everything I want to add to the HP z420?

Do I even need to add the Zumax X4 ZU-750 to the HP z420?

Would a 2x Sata to PCI-e 8-pin be safe, since the the stock PSU (HP 623193-001) only has two PCI-e 6-pin cables?

http://www.newegg.com/Product/Product.aspx?Item=N82E16812400105&Tpk=12-400-105

HP makes a 6-pin to 8-pin connector for this unit, I just couldn't find one.

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If anyone wants to know:

Old/Current System Dell 437t/9000:

http://www.dell.com/us/dfh/p/studio-xps-9000/pd

20GB DDr3
i7 920
PNY 240gb
DVD-rw
BluRay-r
HD 6950
Seagate 1tb 7200rpm
PCI-e Firewire Card
USB 3.0 card
(all usb+firewire listed above)


I'll be using the HP z420 as I used my old Dell 435t, for gaming (mainly csgo) and audio production/recording. Yes, I'm putting a consumer video card into this workstation because I got it extremely cheap so please don't hound me as I've seen others do when applying consumer video cards into a workstations.

Lacking real knowledge of how PSU work, I'm asking these questions here, and any help will be greatly appreciated. I don't want to fry any part of my new (to me) system.

Also, if anyone feels like I'm not asking a (n obvious to you) question I should, please chime in. Any and ALL input is what I'm looking for in regards to upgrading my HP z420. e.g. Video, ram, hdd's, etc...

 

[xiwiwix]

I also have a Thermaltake ToughPower 750w, but since I got it back in '04, I'm not sure it's compatible with my motherboard.

 

[xiwiwix]

Is this website a good source for my answer? http://powersupplycalculator.net/

 

[Optilasgar]

I don't know if you've already figured stuff out on your own, or if you still need answers, but here goes:

IF you try to use a 6+8 pin videocard on the stock HP PSU i would try these 2 steps on order:
1.) get a 6-pin to 8-pin adapter, you can take any you find on amazon or ebay, and use it on one of the 2 6-pin cords on the stock PSU. The worst thing that can happen is the system not booting, with 4 bios beeps (graphics card problem), and you know the power on that PSU RAIL isn't sufficient.

2.) if the first fails, i would advise to use a 2x6-pin to 8-pin adapter and power the 8-pin, and get a 2xSATA-Power to 6-pin. This worked on even very power hungry 780 Ti OC Models.

The reason i advise this route is that 6-pin are usually meant to deliver up to 75 Watts, while 8-pin are meant to deliver up to 150 Watts. So with a 2x6-pin to 8-pin you can be guaranteed to have that port fully covered in spec, while going with 2xSATA-Power to Power a 6-pin (75 Watt) rather than an 8-pin (150 Watt) seems like the far safer bet, seeing as even SATA BluRay Burners typically only consume 25 to 30 W, while Hard Drives, even Workstation High Performance ones tend to stay below 9 W.