Building a PC with some old parts. Looking for guidence. edit: new power supply

[DrenDran]

So I posted this over at Reddit's /r/buildapc, but there's over 300k people there and I doubt it will get much attention. So anyway, I'm about to build a PC. It's my first time building a PC from scratch. I currently have a desktop and a laptop. The desktop is around 5 years old, but I've added some new parts to it since I got it. But now I want to build something new.

I've got about $800 to spend right now, with the intention of buying some things later on. Here's what I'm about to buy:

Product Type	Link	Price
Case	http://www.newegg.com/Product/Product.aspx?Item=N82E16811854023	$70
Power Supply	http://www.newegg.com/Product/Product.aspx?Item=N82E16817438049 Modified	$75
Motherboard	http://www.newegg.com/Product/Product.aspx?Item=N82E16813130880	$175
CPU	http://www.newegg.com/Product/Product.aspx?Item=N82E16819117561	$250
Liquid cooling	http://www.newegg.com/Product/Product.aspx?Item=N82E16835181090	$100

Additionally, I will be gutting my old PC for some things:

Product Type	Link	Price
RAM	http://www.newegg.com/Product/Product.aspx?Item=N82E16820233185&cm_re=cmz8gx3m2a1600c8r-_-20-233-185-_-Product	N/A
SSD	http://www.newegg.com/Product/Product.aspx?Item=9SIA6233S73665&cm_re=Samsung_SSD_840_750gb-_-20-147-250-_-Product	N/A
Another SSD	http://www.newegg.com/Product/Product.aspx?Item=0D9-0006-00089	Comes as a gift with the motherboard

Lastly, I will eventually be buying either a GTX 980 or a GTX 980 ti to put in the machine later on. I might even get a pair someday, but that's pretty far off. Oh, and I will be getting http://www.newegg.com/Product/Product.aspx?Item=N82E16820231929&cm_re=g.skill_tridentz_16gb-_-20-231-929-_-Product as my RAM replacing the old RAM since I assume I can't have both sets of RAM in at once.

So guys, what I want to know is this:

1. Is this all compatible? This seems like the most important thing and even though I can check I'm not quite confident enough to buy based only on my own assessment.

2. What extra little things will I need to buy? I realize I will need things like cables (above and beyond what I can get from my old PC) and things like thermal paste but I have no idea exactly what I need. Any help here?

3. Are there any obvious ways I can save money on this build? Obviously this isn't going to be a budget build, but if there's probably something obvious I overlooked.

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[BluetoothBoy]

PCPartPicker is probably the best way to check compatibility and find the best pricing, I'd suggest that.

Didn't look too in depth at what you have, but a few things to keep in mind:
- Thermal paste comes with the CPU, so you shouldn't need to buy any unless you plan on swapping stuff out a lot.
- Don't forget a disk drive if you think you're going to need one.
- Make sure your CPU has decent enough integrated graphics for what you want if you're not buying a GPU immediately. Based on the CPU you picked, though, you'll probably be fine.

[Nal]

You can go for a lower wattage.

[DrenDran]

You can go for a lower wattage.

How low do you think?


Also, I was told the old RAM is ddr3 and won't work in the motherboard which is *only* ddr4. Is that so? If so, what's the cheapest 8gb of ddr4 RAM I can get that will work well?

[espio100]

With 800 bucks you can get a decent and new one. Mine was 700 dollar with a gtx 960, i5-4430 and 16gigs of ram.
The mobo was overkill tho and couldve gotten a cheaper one if I wanted too.

[DrenDran]

With 800 bucks you can get a decent and new one. Mine was 700 dollar with a gtx 960, i5-4430 and 16gigs of ram.
The mobo was overkill tho and couldve gotten a cheaper one if I wanted too.

Eh, I'm fine with this build. I'm just buying it in segments.
Right now I'm trying to decide on RAM since what I got apparently won't work.
Also if I can get a less expensive power supply that'd be nice.

[MonkeyFunkyMonkey]

Why Water cooling?

[DrenDran]

Why Water cooling?

Overclocking.

Anyway, here's my new power supply:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438049

Apparently my rig needs around 527watts from a calc I used. This supplies 550. Will overclocking require significantly more power?

[Pentium]

As people have already pointed out, your old RAM won't work in the new system (DDR3 vs DDR4), and putting a 760W PSU in a mini-ITX build is completely pointless. I'm also not a fan of closed-loop water coolers since they're often not much better than high-end aircoolers, are louder and have more failure points. This is my suggestion:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6600K 3.5GHz Quad-Core Processor  ($244.99 @ NCIX US)
CPU Cooler: CRYORIG H5 Ultimate 76.0 CFM CPU Cooler  ($46.99 @ Newegg)
Motherboard: Gigabyte GA-Z170N-Gaming 5 Mini ITX LGA1151 Motherboard  ($149.99 @ Amazon)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory  ($89.99 @ Amazon)
Case: Phanteks Enthoo EVOLV ITX Mini ITX Tower Case  ($75.98 @ Newegg)
Power Supply: Corsair RMx 550W 80+ Gold Certified Fully-Modular ATX Power Supply  ($99.99 @ Newegg)
Total: $707.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-12 18:04 EST-0500

EDIT:

Overclocking.

Anyway, here's my new power supply:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438049

Apparently my rig needs around 527watts from a calc I used. This supplies 550. Will overclocking require significantly more power?

Won't even break a sweat. Power supply calcs aren't very accurate and overestimate numbers a lot; it's better to look up how much the individual components consume and do the math yourself.

[DrenDran]

That's actually quite helpful Pentium. That build you suggested, would it be able to support the Graphics Card I want as well as overclocking the CPU? I assume so.  I might actually go with that.

[Pentium]

Yes and mostly yes; you might want to get a slightly better cooler than the H5 depending on how high you want to OC and how paranoid you are about temps. When HardOCP tested the cooler with their 4.4 GHz 4770K it peaked at 82°C which is a little toasty but then again Skylake processors should have better thermal paste between the CPU and IHS than Haswell. Getting an exhaust fan for the case is a good idea too (will find one for you tomorrow).

[DrenDran]

Yes and mostly yes; you might want to get a slightly better cooler than the H5 depending on how high you want to OC and how paranoid you are about temps. When HardOCP tested the cooler with their 4.4 GHz 4770K it peaked at 82°C which is a little toasty but then again Skylake processors should have better thermal paste between the CPU and IHS than Haswell. Getting an exhaust fan for the case is a good idea too (will find one for you tomorrow).

One last question as I'm about to buy:

Is there anything else I need to get with this? e.g. cables or thermal paste or whatever that won't come with the parts? I can get some stuff from my old PC

[Sylvanor]

where are the old parts

[espio100]

One last question as I'm about to buy:

Is there anything else I need to get with this? e.g. cables or thermal paste or whatever that won't come with the parts? I can get some stuff from my old PC

Cables comes with the PSU and thermal paste usually is preapplied or comes with the cpu cooler.
Cable ties maybe