Sup, i want to upgrade my PC and could need some advice on for choosing the correct hardware.

My System:

-OS: Win 7 Home Premium

-CPU: AMD Athlon(tm) II X4 620 Processor (2400 Mhz)

-Videocard: NVIDIA GeForce GTX 260 (896,00 MB)

-Mainboard: ASRock A770DE+ (Supports for AM3 / AM2+ / AM2 processors)

-RAM: 4,00GB

-Drives: 1.) SAMSUNG SSD 830 Series SATA Disk Device (238,47 GB)
2.) WDC WD75 00AADS-00L5B1 (698,64 GB)

-PowerAdapter: Sharkoon Rush Power M SHA-R600M 600W


Added the SSD recently and it was obviously a massive boost to the system, although my MB only supports SATA2.
I usually only use the system for poker (if, then mostly masstabling), Autocad3D, Multimedia and Internet.
With Autocad im experiencing tho most problems lately when designing in 3D.

So basically my questions are?

1.) Would it make sense to keep the Mainboard and only replace the CPU with f.e. a Phenom II X6?
-If yes, would i have to change the Power Adapter?

2.) If i would choose a new Mainboard + new CPU, which "Bundle" can u recommend that wouldnt exceed about 300 dollar costs overall?

3.) What else would u recommend, when looking on my system on paper?

4.) Should i just buy a new PC?

1) Not really. First because the X6 wouldn't be that big an improvement in processing power [compare]. Second because you'd still have just SATA2. Third because you'd still be sitting on 4GB of relatively slow DDR2 RAM which will bottleneck that CPU improvement a bit.

2) If my budget were exactly $300 for CPU+board+RAM, I'd shop like hell to find combo deal or sales that would net the following:

2x4GB (8GB) DDR3 1600 RAM
Intel i5-3570, 3550, 3450 CPU (in that order)
A Z77 (preferred) or H77 board

It's pretty tight but any kind of deal should get that happening at $300. Any of those chips at stock speeds are monsters.

2a) Make your budget $400, and you could go with an i5-3750k, 8GB DDR3 RAM, a $30 aftermarket cooling fan, and a modest but very serviceable Z77 motherboard. That gives you just about as fast as fast gets and comes with all of the goodies like SATA3, USB 3.0, and the option to use Intel's best integrated graphics package which shouldn't be too far off of your current card. And you can overclock the chip a fair ways which isn't an option without a "k" chip.

2c) There are other options for less, such as an AMD FX-4100 quad or better yet 6100 6-core. Not quite in the same performance class as the i5 but very good chips and priced well, as are the baords. Your CPU/RAM/board would come out to about $250 and be more than suitable for AutoCad and usually have your SATA 3. Add a little for a good cooler for sure.

3) Your PSU brand is about as obscure as they come, and from what I can tell is only available in Europe. The few reviews on it I could find were mostly good and it doesn't figure to be that old, so there's that. I'd be nervous trusting nice components to it but that's how I am about power supplies.

4) It depends on how you feel about the "other" parts. Do you trust the power supply? Do you have a retail or OEM copy of Win7 of your own, or is it a Dell disc you won't be able to use? Does the case work for you? Do you have a usable SATA-based DVD drive or does it connect with old-school IDE? I'd say if the rest of it is usable then upgrade, if not buy/build something else.

I mean you have a Samsung 830 which is a top end part right now. I'd finish the job with core components of the same performance level, and forget about upgrading anything for 4 years. AutoCAD is fairly CPU and RAM intensive if you're on the fence about it.

Thx a lot for the quick answer, that really helped me out.
I checked the DVD drive and it is SATA based i hope. In my sysinfo i found this:

-HL-DT-ST DVDRAM GH22NS40 SATA CdRom Device

When i bought the PC it was preinstalled with Vista 64 because win 7 wasnt on the market yet, but they sent me a code for free to preorder a win 7 upgrade DVD. So i did that and simply upgraded Vista with it. However when i picked up the Samsung ssd i formatted my old HDD completely and after that had no problems doing a fresh install of win 7 with the Upgrade-DVD on my SSD.
In the Product ID "OEM" is included so i guess i def. have an OEM Version, so that probably means i cant change my Motherboard, right?

If i will do the upgrade i will go with the AMD FX 4100 and a suitable Mainboard with SATA 3 and 8GB DDR3 RAM. After some research im 99,9 % sure that this would be more than enough "power" for me.

No question, the FX 4100 is enough and priced right. That's about the minimum upgrade I would recommend from where you're coming from though. I could also suggest dropping say a Phenom 2 black edition chip in your existing setup. It would absolutely be an improvement, and inexpensive too, but it comes with all of the old drawbacks so not ideal.

Maybe. The EULA may not allow it, but I swapped motherboards (really, moved hard drive from one computer to the other) with an 'OEM' Win7 and it didn't complain at all, there's some debate over whether EULA restrictions like that are even enforceable, and Microsoft certainly is not going to press charges against you over it.

One thing you definitely should do to increase the chances of success is backup your boot drive and then uninstall any motherboard specific drivers before you shut down the computer to do the upgrade.