Requesting Knowledgeable Assistance With Component Comparison of Pre-Built vs Custom PC

I can do this but unfortunately, I need someone more knowledgeable then myself to do the part by part comparison because Dell does not list the brand/exact model of ram, mobo, PSU, CPU cooler they use, but someone more experienced and knowledgable then myself can glance at the specs on the website (or may have had an Alienware A51 system before) and tell what closest to, or equivalent components they use and compare them to a custom build.

Ah, kk; here are the entirety of the specs provided on both websites for the pre-built PC:

5th Gen Intel® Core™ i7-5820K processor
Features a 15MB cache and up to 3.8GHz processor speed with Turbo Boost.
Intel® Core™ i7 processor
Delivers efficient multiway processing for ultimate smart performance. Intel® Turbo Boost Technology delivers extra performance when you need it and increased energy efficiency when you don't.
8GB DDR4 memory
For multitasking power, expandable up to 32GB.
Multiformat DVD±RW/CD-RW drive with double-layer support
Records up to 8.5GB of data or 4 hours of video using compatible DVD+R DL and DVD-R DL media.
2TB Serial ATA hard drive (7200 rpm)
Offers spacious storage and fast read/write times.
NVIDIA GeForce GTX 980 graphics
For lush images with rich, lifelike detail.
9-in-1 media reader
Allows you to access data stored on compatible cards (not included).
6 USB 3.0 and 4 USB 2.0 ports
For fast digital video, audio and data transfer.
Built-in Intel® 7260 2x2 high-speed wireless LAN (802.11ac)
Connect to the Internet without wires.
Bluetooth 4.0 interface
Enables simple wireless pairing with compatible devices.
Built-in 10/100/1000 Ethernet LAN
With RJ-45 connector for easy wired Web connection.
Microsoft Windows 8.1 64-bit operating system preinstalled

Alienware™ 1500 Watt Multi-GPU Approved Power Supply with modular cabling

Processor Cooling
Alienware Premium CPU Liquid Cooling

Motherboard
ATX Motherboard (no details)

Chipset
Intel® X99 Express Chipset w/ Unlocked BIOS for Overclocking*, CPU Socket 2011

AlienFX Lighting Zones
Enhanced AlienFX System Lighting - (custom full tower case)

application launcher
- Accelerator performance optimizer (custom OC software not found in built PC)


Those are the listed components compiled from both Alienware's and BB's website. I've provided the links to both websites below in case you see something I missed that you might be able to get more info from. If you can, please try to make a custom PC through PC part picker with the all the exact or equivalent parts (including case & software) so I can get the most accurate price comparison available. I've tried to do it myself a number of times but I always have trouble with finding a few equivalent components due to my lack of knowledge, thus not getting an accurate comparison. I know a knowledgeable individual like yourself or someone else on these forums can do a much better job then I and find the rough equivalents, if not the exact parts they use in the Area 51 so I can make a more informed purchase.

All the info; with the exception of the few components that Alienware does not disclose the exact brand/models of, is provided in the post and link referenced above.

Well, surely the components can be roughly compared. The RAM, mobo, and power supply are not made by Dell and are components available like any other; its just a matter of finding someone who can do a rough comparison either by having experience through owning/seeing one in person to confirm the components they use, or by having some other inside information of the specs used.

Buy yes, Alienware definitely does not post the exact specs for a reason. I just don't think Alienware is all that more expensive or as poor a computer manufacturer as the custom PC community makes it seem. Simply, I'm trying to do the most accurate comparison possible so I can really weigh the pros/cons.