Windows 7 or Windows 10?

[djdelarosa25]

Intel Core 2 Quad Q9550 @ 2.83 GHz

nVIDIA GeForce 9400GT

3 GB DDR2 RAM

 

Windows 7 or Windows 10?

32-bit or 64-bit? Might upgrade to 4 GB of RAM soon.

[alexhelvetica]

I'd go 7 since I dislike 10, plus that GPU may not have 10 drivers.

[eagerigor]

win10 but use 32 bit version

[ZetZet]

I'd go 7 since I dislike 10, plus that GPU may not have 10 drivers.

there are drivers and w10 runs WAY better on weak computers.

[alexhelvetica]

there are drivers and w10 runs WAY better on weak computers.

Okay, you are correct.

[H4X3R]

Depends if you can find drivers for Win10 for your components. If so, then use win 10 (although i would prefer win 8.1).

[djdelarosa25]

32 or 64-bit?

[djdelarosa25]

win10 but use 32 bit version

If I upgrade the RAM to 4 GB, what should I use?

[acturisme]

If I upgrade the RAM to 4 GB, what should I use?

Either.  The ram limit for 32 bit is close to 4GB.

[djdelarosa25]

Either.  The ram limit for 32 bit is close to 4GB.

What would have better performance? Wouldn't I be wasting RAM with 32-bit on 4 GB?

[eagerigor]

What would have better performance? Wouldn't I be wasting RAM with 32-bit on 4 GB?

no. 

[ChatDaw]

Intel Core 2 Quad Q9550 @ 2.83 GHz

nVIDIA GeForce 9400GT

3 GB DDR2 RAM

 

Windows 7 or Windows 10?

32-bit or 64-bit? Might upgrade to 4 GB of RAM soon.

There is drivers for Windows 10, I tested recently a 9500GS and it worked perfectly, so there should be drivers for a 9400GT too.

It really depends which one you prefer.

I would ALWAYS use 64-bit OS if possible, I highly recommend it. (because you'll be able to use all of your 4GB of RAM when you upgrade it)

[Spartan195]

Windows 10 32-bits, then when you upgrade your ram change it for a 64 bits, . needless to ask

 

with old pc windows 10 i huge better

[iamdarkyoshi]

Win10. I have windows 10 on my garage PC and its quite fast and snappy, despite having 3GB of RAM, some really old fanless single slot GPU, and a core2duo at 3ghz. 

[inb4after]

Win 10 for gaming, win 7 for everything else. Also go for 64-bit, but it should be default if you're upgrading from a 64-bit base win7/8/8.x. Judging purely on your system specs, you ideally want a 64-bit win 10 to get a little more performance in non cpu-intensive games.