Please help choosing PSU for Lenovo desktop H535 (machine type 10117)

[ESayan]

Greetings everyone,

I don't know too much about computer hardware so please bear with me. I know how to change RAM or HDD but that's about it. I would appreciate any help.

I am trying to upgrade my son's desktop with a better GPU. He has Lenovo H535 (machine type 10117) with A8-5500 3.2Gb, RAM 6Gb and intergated AMD Radeon HD 7560D graphics like this one:

http://www.microcenter.com/product/437525/h535_desktop_computer

I ordered MSI Radeon R9 380 DirectX 12 R9 380 GAMING 4G 4GB 256-Bit GDDR5 PCI Express 3.0:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127878

I couldn't find any formfactor information in the user guide (https://download.lenovo.com/consumer/desktop_pub/lenovo_h5_ug_v1.0_en_r_online_20130322.pdf) or hardware maintenance manual (https://download.lenovo.com/consumer/desktop_pub/lenovo_h505-520-535_hmm_20130419.pdf).

According to label on the PSU it's 170W (AcBel P/N SP50A33577).

I searched web a lot in last several days and I think that the installed PSU is TFX form factor (although I couldn't find it anywhere) and that the motherboard is Micro-ATX (again just my guess based on what I read).

From other people who bought the same GPU it looks like I need a 600W PSU and the maximum for TFX PSU I could find is 300W.

So I wonder if ATX PSU will fit in my my case. If yes I would appreciate recommendations.

If it won't fit what are my options? Is getting a new ATX case a stupid idea? How difficult will be to transfer everything from my case to ATX case (remember, I don't have too much experience)? If it does make sense - what case you would recommend?

Another option is to return the video card and buy another one. He wants to play Verdun (Steam) and similar games.

Thank you for helping me

 

[Karsten75]

Can you post the physical dimensions of the current power supply and also whether there is visible clearance around the PSU in all 3 dimensions? visible

 

[ESayan]

Can you post the physical dimensions of the current power supply and also whether there is visible clearance around the PSU in all 3 dimensions? visible

In case tower standing position PSU sizes are (WxHxD): 150 mm x 85 mm x 100 mm. It takes pretty much the whole width of the tower. There is plenty of space in the depth (maybe another 100 mm).

Looking at the back of the case in standing position:

Space below PSU (it's mounted on the top of the tower) is restricted partially by the motherboard ports on the left. There is a space for a fan right under the PSU on the right (about 100 x 100 mm).

Here is a view to the back of the case:

https://drive.google.com/file/d/0B3eBVz0fScXTdjl3MjVaajdSMFE/view?usp=sharing

And this is a picture of inside view:

https://drive.google.com/file/d/0B3eBVz0fScXTQ2FXSDBwSE1OQUk/view?usp=sharing

Thank you for helping me