For your question about RAM it's simply based on price, same for the cooler.
ASUS has good motherboards but I'd tend to steer clear of the Extreme4 after it's Z77 incarnation and MSIs G45 has crap VRM cooling. The Gigabyte is a pretty brilliant board for the price but the Asus one for the same money is good. Biostar stuff is good now too, the reason I've chosen it for the second build though is it's pretty much all I can fit in with 16GB of RAM being chosen.
If you'd rather go Nvidia that's fine but your concerns about VRAM will be more of an issue there as they have the 650 Ti Boost and 660 on a 192-bit bus so the 2GB ones are effectively a 1.5GB card whereas the AMD is on a 256bit bus and doesn't have that issue. Plus it's an extra $60 over the AMD card for the cheapest 660 and an extra $34 for the 650 Ti Boost
http://www.newegg.com/Product/Produ...-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID= and
http://www.newegg.com/Product/Produ...-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
AMD drivers are equally as stable as Nvidia at this point in time, just less feature rich.
As for 3GB of VRAM, it'll not matter on cards at this end of the market.
for the CPU, what's your thoughts bout the new AMD Kaveri APU?
http://www.anandtech.com/show/7507/amd-kaveri-apu-launch-details-desktop-january-14th
so if i wanna go with 16 GB, the best choice is your Biostar Hi-Fi Z87W ATX LGA1150 Motherboard ? if so, how should i know this while i'm searching for another options?
as a quick look on my local market, i found these -some aren't from your selections, but just to have an idea bout the prices-:
Intel Core i5-4670K $233
Intel Core i7-4770K $338
NZXT Respire T40 120mm Fan CPU Cooler $43
these board prices are between $165-$210:
========================
ASRock Z87 Pro3
http://www.asrock.com/mb/Intel/Z87 Pro3/
ASRock Z87 Pro4
http://www.asrock.com/mb/Intel/Z87 Pro4/
ASRock Z87 Extreme3
http://www.asrock.com/mb/Intel/Z87 Extreme3/
ASRock Z87M Extreme4
http://www.asrock.com/mb/Intel/Z87M Extreme4/
Z87-G43
http://www.msi.com/product/mb/Z87-G43.html
GA-Z87-HD3
http://www.gigabyte.com/products/product-page.aspx?pid=4489
GA-Z87-D3HP
http://www.gigabyte.com/products/product-page.aspx?pid=4519
GA-Z87X-D3H
http://www.gigabyte.com/products/product-page.aspx?pid=4518
Z87-K
https://www.asus.com/Motherboards/Z87K/
Z87-C
http://www.asus.com/Motherboards/Z87C/
Z87-A
https://www.asus.com/Motherboards/Z87A/
==============
GPU:
==================
nvidia 760 price is between $337-$394::
EVGA GeForce GTX 760
http://www.evga.com/Products/Product.aspx?pn=02G-P4-2761-KR
EVGA GeForce GTX 760 w/ EVGA ACX Cooling
http://www.evga.com/Products/Product.aspx?pn=02G-P4-2763-KR
GV-N760OC-2GD
http://www.gigabyte.com/products/product-page.aspx?pid=4663#ov
GTX760-DC2OC-2GD5
https://www.asus.com/Graphics_Cards/GTX760DC2OC2GD5/
N760 TF 4GD5/OC (GeForce GTX 760 GAMING)
http://www.msi.com/product/vga/N760-TF-4GD5-OC.html#overview
===============
AMD 7850 price is $229:
SAPPHIRE HD 7850 2GB GDDR5 (11200-07)
http://www.sapphiretech.com/presentation/product/product_index.aspx?pid=1654&lid=1
R7850 Twin Frozr 2GD5/OC
http://www.msi.com/product/vga/R7850-Twin-Frozr-2GD5-OC.html
==
extras:
SAPPHIRE DUAL-X R9 270X 2GB GDDR5 OC WITH BOOST $267
http://www.sapphiretech.com/presentation/product/?pid=2037
SAPPHIRE HD 7870 GHz Edition 2GB GDDR5 $305
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1160&lid=1&pid=1473
=============
without searching online, i think these prices are ridiculous, so i think i'll import all / some parts from US e-stores like amazon or such cause newegg doesn't accept non-US credit card-
the only annoying thing, that i'd to expect the shipping and importing charges would be up to $180 !!! <<
this is the price my friend paid for importing a package included GPU+ Motherboard+ keyboard+ CPU + Mouse , all new in their retail boxes
so, i have to look for more prices , if the difference in the prices more than $180 locally vs. online, i'd order the parts online, tho i have to sacrifice the warranty cause i cant send back any defective parts due to high shipping charges
as for the GPU, thanks for explaining, i never thought of 600 family, so i ignored that fact bout bus rate, and it seems my other option instead of 7850 is going for 760?
sorry for the long post again, but this one gonna make me see everything clearly