Step-By-Step Guide: How To Build a Gaming PC With AMD's Bulldozer CPU
The Mission
AMD’s Bulldozer architecture finally hit retail in October 2011, and Gordon put the highest-performing chip, the
FX-8150, through the wringer. His conclusion: It’s a decent competitor to Intel’s i5-2500K, but no match for the (much more expensive)
Sandy Bridge-E or 2600K parts.
And that’s OK; there are plenty of reasons to want a solid midrange
performer. Maybe you really, really want to be able to say you have an
eight-core processor. Maybe you’re opposed to Intel for religious
reasons. Or maybe you just want real PCIe x16 lanes without having to
put out for the pricey X79 platform.
Whatever your reason, an FX-8150 can be a respectable foundation for a
solid gaming rig since modern gaming is still more about the GPU than
the CPU. In this article, we'll give you a step-by-step walkthrough of
our build--if you're wondering how to build a killer gaming PC of your
own, read on!
A previous version of this article incorrectly said we used 38GB of RAM. Maximum PC regrets the error.
Building from the CPU Out
Central to my build, of course, is AMD’s top-tier Bulldozer part, the
3.6GHz FX-8150. It’ll rest in Asus’s Sabertooth 990FX motherboard,
which has USB 3.0, six SATA 6Gb/s ports, and plenty of PCIe x16 lanes.
The 990FX isn’t markedly different from 890FX except for one glaring
change: Board vendors are now offering SLI “support” (read unlock codes)
in the BIOS. I was originally going to use Cooler Master’s Hyper 212
Evo CPU cooler, but in the course of overclocking I decided to swap it
out for AMD’s Asetek-built Bulldozer FX liquid cooler, which bears a
very strong resemblance to Antec’s Kuhler 920.
To keep things in the AMD house and at the $1,500 price point, my graphics card of choice is the
Radeon HD 6970.
It’s got enough juice to power any game on the market at reasonable
settings, and at $330 it fits well with my budget without being a budget
card.
NZXT’s just-launched
Phantom 410
is a smaller version of the original Phantom, with a few more fans and
USB 3.0 support. Corsair’s TX750 v2 PSU is more than enough power for my
overclocks and any extra graphics cards I want to add later.
The one wild card in my build is the hard drive. Thanks to the
still-ongoing Thailand floods, the price of a 750GB 2.5-inch hybrid
drive is (at press time) only a little more than a 1TB 3.5-inch drive.
The 8GB of NAND cache on the Momentus XT gives a performance boost to my
most frequently accessed sectors of the disk, so boot and oft-used
programs will be faster.
Assembling the Hardware
Step 1: Prep the Board
To install the CPU, lift the socket arm and gently lower the CPU into
place, making sure the triangle on the CPU’s corner is aligned with the
correct corner in the socket. Lower the lever back into place. Install
the RAM into the second and fourth slots (the tan ones).
Step 2: Prep the Case and Install Motherboard
Before we start building into the case, it’s time to move some fans.
Remove the side, top, and front panels from the case, then remove the
rear 12cm exhaust fan and top 14cm exhaust fan. This will involve
unplugging them from their fan controller connectors behind the
motherboard tray. Use the long screws provided to install the 12cm fan
in the front of the case, directly above the existing intake fan.
Reconnect it to one of the fan control connectors behind the motherboard
tray. Set aside the 14cm fan and its screws for now.
Install the motherboard standoffs in standard ATX configuration, put
the motherboard I/O shield in place, then install the motherboard in the
case.
Step 3: Install the CPU Cooler
If you’re getting flashbacks to last month, I don’t blame you. AMD’s
Bulldozer-branded liquid-cooling system is built by Asetek, the same OEM
who makes Intel’s RST2011LC liquid cooler, and is, in fact, nearly
identical to the Asetek-made Antec Kuhler 920.
The instructions say to
install the cooling fans as intakes, but we’re going to use ours as
exhaust. Attach one fan to the inside of the cooler, then attach the
other through the exhaust fan mounts to the radiator (image D). Run the
radiator fans’ power cables behind the motherboard tray.
Next, assemble the cooler mounting bracket as shown in AMD’s instructions and clip it to the CPU heatsink.
Unscrew the four screws attaching AMD’s cooling mount to the
backplate and remove the plastic mounts. Mount the CPU cooler/pump unit
to the AMD backplate, tightening the mounting screws in an X-shaped
pattern.
Attach the 3-pin pump power cable to the CPU_FAN header and run the
radiator fan Y-connector behind the motherboard tray to the radiator fan
cables. Run the USB 2.0 cable behind the motherboard tray to the bottom
of the motherboard and connect it to a USB 2.0 header).
Install the GPU in to the topmost x16 PCIe slot.
Step 4: Install the Drives
Remove the top optical drive bezel and replace the case’s front
panel. Slide the optical drive into that bay and secure it with the
toolless mechanism. Add thumbscrews if you like. Take a hard drive tray
from the cage and remove the mounting posts from the sides. Install the
Momentus XT using the 2.5-inch mounting holes on the bottom of the tray.
Replace in bay.
Step 5: Install the PSU
Install the power supply into the case with the fan facing down.
Bring the dual-4-pin ATX auxiliary power cable, 24-pin ATX power cable,
and two 6-pin PCIe power cables through the cutout nearest the PSU to
the back of the motherboard tray. Bring the auxiliary ATX power cable
through the opening at the top of the motherboard tray and connect it
(image I). Bring the 24-pin motherboard power cable through the top side
cutout and connect it, then connect the 6-pin PCIe connectors to the
GPU—one will require the use of the 2-pin connector, as well.
Step 6: Finish the Wiring
Replace the top 14cm fan, but flip it around so that it’s used as an
intake fan rather than exhaust. This will keep the motherboard voltage
regulators under the radiator from overheating.
Connect the fan power lead to one of the fan controller connectors behind the motherboard tray.
Connect the front-panel connector power and LED switches to the
board, as well as the HD Audio, USB 2.0, and USB 3.0 connectors. Connect
SATA power and data cables to the optical and hard drives, then connect
6Gb/s SATA cables from the drives to the lowest set of SATA ports on
the motherboard.
Use zip ties to tie excess fan controller connectors and case wiring
to the rear of the motherboard tray. Bundle the unused power connectors
here as well, if you can fit them.
Step 6: Into the BIOS
At this point you should connect your monitor, mouse, and keyboard
and turn on the rig. Enter the BIOS’s Advanced Mode, go to Boot, and
deselect “Wait for F1 on Error.” This will prevent the system from
hanging up due to a perceived fan-speed error from the pump. Exit out of
the BIOS, and install Windows and your drivers as normal, making sure
to install the ChillControl software for the CPU cooler.
Once Windows is set up and working, it’s time to tweak the CPU a
little bit. Bulldozer parts seem to vary in their overclocking
stability: After many overly ambitious overclocks, I got to 4.2GHz,
mostly by upping the CPU multiplier, but I’ve seen overclocks of over
4.8GHz with the same CPU and motherboard, so your mileage may vary.
Middle-Class Dreams Acquired
Given that Gordon had already benchmarked the FX-8150, I wasn’t
expecting miracles, and I didn’t get them. The Bulldozer rig pulled down
respectable scores for a $1,500 rig, but I didn’t really see any
benefit from eight cores at 4.2GHz that wasn’t exceeded by a quad-core
i7-920 at 3.5GHz. I was really surprised by both the difficulty of
maintaining a stable overclock and the lack of oomph I got when I did
manage to overclock.
After spending hours trying to stabilize my Bulldozer system at
4.8GHz and 4.6GHz, both of which I’d seen run on the same motherboard
with the same processor, I had to lower my sights a little. I finally
settled on a stable 4.2GHz—17 percent faster than stock. On CPU-bound
benchmarks, though, like Vegas Pro and MainConcept Reference, I saw less
than a 10 percent improvement over the FX-8150 at stock, and the other
benchmarks showed even less improvement. FX-8150 chips seem to be
variable in their tolerance for overclocks, so you might have better
luck.
Of course, the lower scores on encoding tests could also have to do
with my boot drive. I normally prefer to run with an SSD boot drive, but
I went with a hybrid drive this time. The disk access speed and
slower-than-solid-state write speeds doubtless affected the encoding
tests, which all involve reading and writing large files to the disk.
That said, Bulldozer does offer better thermal performance. My
FX-8150 never got above 55 C, even running Prime95 at 4.2GHz, which is
far lower than we’d see from the overclocked i7-920 in our zero-point
test bed.
If your budget allows for it, you may want to go for a multi-GPU
setup. Unlike Sandy Bridge motherboards, which can run two x16 PCIe
videocards but only at x8, the Sabretooth 990FX can run them at their
full x16 speed. Does it really make a big difference? In the vast
majority of cases no, but hell, you can at least rub it in the noses of
your friends running at x8 speeds.
For a $1,500 machine, the Bulldozer rig does offer a lot of
performance, although unless you’re running heavily multithreaded
applications you probably won’t notice the difference between its eight
cores and a decent quad-core—especially if the quad has Hyper-Threading.
At this point, diehard AMD fans will probably just be happy to hear
that a Bulldozer-powered rig holds its own at its price point. A
Bulldozer rig isn’t the fastest money can buy, but for the price, you
get a lot of cores, decent performance, and full PCIe lanes to grown
into.