He's not. Totally wrong

Sam używam GTX'a 970 wraz z i5-4690k i 8 gisów ramu. Mam zasilacz 550W który jest sporo o wiele ponad. Bez problemowo wystarczyłby 400W, nie kręcę procka ale do tego to i nawet by starczyło (ewentualnie 450W). Ludzie nie mają pojęcia o czym mówią i piszą pierdoły hurr durr mocny zasilacz. 750W do takiego setupu to po prostu overkill. 550W ci bezproblemowo wystarczy. Jak chcesz się bawić w mocne podkręcanie to można dołożyć do 600w, ale i tak 550W jest ok, pi razy oko twój setup będzie zżerał niecałe 450W

Procesor - nie wiem do czego konkretnie będziesz używać jeszcze PC, ale jak tylko do grania to nie wiem czy jest sens brać i7. Moja i5 nie kręcona bez problemu wraz z 970 ciągnie wszystko jak leci a zawsze mogę ją podkręcić na 4.2-4.5 GHz

Ponownie - pamięć. 2400 MHz to overkill. Jeżeli do grania to nie zauważysz żadnej różnicy między 1600-2000-2400. Bo praktycznie jej nie ma. Po prostu. Różnica w wydajności jest taka minimalna że nie warta wspominania. Do tego zaznaczam że ta płyta obsługuje 2400 MHz dopiero po kręceniu w Biosie, standardowo maks jest 1600

EDIT: Sam mam ramki 1866

Power supply components degrade over time (especially when you're going to be pushing it to its limits), so you always want to leave room for that when purchasing. Like stargazer13 said, I'd go 750w or so to be on the safe side.

you can buy more ram in the future.
take a look at other companies.

You will need more than 8gb RAM If you "..want to run any game smoothly on best graphic options on it" as you said.

I'm Polish too, and yeah, it's 1 of the 2 HDD's I'd consider getting right now (the other being http://www.morele.net/dysk-western-digital-caviar-blue-3-5-1tb-sata-600-7200rpm-64mb-cache-wd10ezex-479659/ which I have in my PC right now) but it's basically 50/50 between them, they're both great so go get the cheaper one ^^

Hard to say if it will be good for 5 or more years considering games are evolving so fast, but I reckon it will run everything for at least 3 years.

If you're planning on doing some video editing, 16 Gb is definitely the better option. It's also better if you get your RAM from one single kit so you avoid mismatched sticks.

Tak jak przedtem pisali, co do i7 to jeśli masz zamiar robić coś oprócz grania (renderowanie, grafika etc.) to zostaw.

Jeśli chcesz tylko grać w gry na nim to możesz zejść do i5 4690 / i5 4690k. W chwili obecnej gry znacznie bardziej wykorzystują GPU niż CPU (od dawna ludzie się zastanawiają czy hyperthreading coś zacznie pomagać w grach, ale nadal na to nie wygląda [masz tu benchmark w GTA V jakby co: https://www.youtube.com/watch?v=SLs-sMteggg )

Let's keep it in english, after all not everyone learned polish yet )

I'm not tracking gaming performances - it's very low on my priorities list (I need silence, cores & memory bandwidth and no water inside). Compare same clock speeds - I don't think difference will be much bigger then measurement error.

Don't believe that much in those 'client reviews' - most are written within few weeks after purchase and well. No surprise most are good.
I've been seeing lots of bad opinions about seagates in recent years - they tend to die much more often then competition. Bit of a gamble tbh. But if losing data stored on it is no biggie may be worth to buy.

Batman AK is a hot mess anyway on both SLI and single card, cannot really judge by that game. Even if SLI has some problems at launch, it is usually fixed within a short time, you can use just one of the cards until then. Not saying that you should definitely get SLI, but it's good to have as an option.

The next generation of NVIDIA GPUs, supposedly way way faster than the current-gen.

Pardon me for my lack of knowledge then, huge props to Poland for developing their own tech.

If you do a lot of video encoding, look for comparisons of 2 channel vs 4 channel memory platforms. There might be meaningful performance difference (and real possibility that HT will not choke on memory bus)

Beyond upping the PSU and maybe changing the CPU to an i5 it looks all good. You might want to increase you the size of the at least the hard drive. I know some of the Seagate drive also are more prone to failure (the 3tb if I remember). All in all a good system. There are so many options that it is actually impossible to build the perfect system.

Basically, the better the metal, the more power-efficient it is. Everything 80+ has 80% efficiency, but the better the metal, the less required energy the PSU gets from the outlet.

According to wiki, Bronze is at least 82% efficient. Gold, for example is at least 87% efficient. So, if you're using 500W of power, the Bronze is actually grabbing approximately 610W of power from the wall, while Gold is grabbing about 575W. It adds up over years of use in your electric bill. Platinum/Titaniums are even better.

Also, I'm partial to Corsair and Cooler Master when it comes to power supply units. ^^

Edit: Fixed Gold wattage