The Athlon 64's integrated single-channel DDR400 memory controller has given chipset manufacturers one less feature to worry about, and I'm sure that's helped NVIDIA integrate all the nForce3 150's hardware onto a single chip. The nForce3 150 interfaces with the Athlon 64 via a 600MHz HyperTransport link that offers 16-bit downstream and 8-bit upstream data paths. There's been some concern that the nForce3's HyperTransport implementation doesn't offer sufficient bandwidth, especially considering the fact that VIA's K8T800 chipset uses a 16-bit, 800MHz link in both directions. With 600MB/sec of bandwidth, the nForce 150's upstream link is a matter of particular concern. However, if we consider the chip's lack of integrated Serial ATA and Gigabit Ethernet, and its basic AC'97 audio implementation, 600MB/sec may actually be plenty.

That's right, I said basic AC'97 audio. NVIDIA, a company whose powerful nForce2 Audio Processing Unit took the enthusiast and gaming markets by storm, offers only basic AC'97 audio capabilities in the nForce3 150. No hardware acceleration for 3D audio. No real-time Dolby Digital encoding. That NVIDIA didn't integrate its APU into the nForce3 has to be one of the biggest disappointments of the year, but just because NVIDIA isn't delivering on the audio front doesn't mean that the ZNF3-150 falls flat.

Rather than force users to purchase an auxiliary sound card to avoid the nForce3's basic audio capabilities, Chaintech taps VIA's Envy24PT audio controller to drive the ZNF3-150's 7.1 output channels. With a little help from the Envy24's Sensaura drivers, the Envy24PT supports all sorts of 3D audio goodness. The audio chip can also sample audio at up to 96kHz with 24 bits of resolution, though the ZNF3-150's sampling rates are limited by its codec chips.

Since 7.1-channel codecs are hard to come by, Chaintech combines VIA's VT1616 codec with Wolfson's WM8728 DAC to feed the Envy24PT's analog input and output channels. Wolfson's DAC can handle 24-bit audio at up to 192kHz, so it doesn't have to downsample audio streams coming from the Envy24PT. However, the VT1616 is only capable of sampling 18-bit audio at up to 48kHz, which is a little beneath the Envy24.

True 24-bit/96kHz audio quality on all input and output channels is probably a lofty expectation for integrated motherboard audio, but the fact that the ZNF3-150's front output channel is fed through the VT1616 while the center, rear, and surround outputs run through the Wolfson DAC completely boggles my mind. If anything, the front output channel should run through the Wolfson DAC to ensure the best audio quality for music playback.

To Chaintech's credit, I've yet to see an Envy24PT implementation—on a motherboard or otherwise—route front-channel output through a true 24-bit DAC. During music playback, the ZNF3-150 sounds pretty good for an integrated audio implementation, but I can't help wondering if the board could sound better with Wolfson's DAC handling the front output channels.

Moving from audio to storage, the ZNF3-150's Serial ATA and RAID capabilities deserve a little attention. The nForce3 150's lack of Serial ATA support is one of the chipset's biggest weaknesses, but the ZNF3-150's Silicon Image Sil3114 SATA RAID controller nicely fills the void. In addition to serving up four Serial ATA ports, the Sil3114 supports RAID 0, 1, 5, and 10 arrays that balance performance with redundancy and storage capacity.

In the networking department, Chaintech calls on Broadcom's BCM5788 Gigabit Ethernet chip, which seems to be a popular choice among many motherboard manufacturers. Unlike Intel's CSA-attached Gigabit Ethernet chips, the BCM5788 rides the PCI bus and could contribute to a bandwidth bottleneck. Surprisingly, the ZNF3-150's potential for bandwidth clogging actually has nothing to do with its narrow HyperTransport uplink; it's the fact that all the board's peripherals share the PCI bus that could make things messy. With the board's audio, Serial ATA RAID, Gigabit Ethernet, and Firewire capabilities running through the same pipe, the PCI bus has the potential to be a serious bottleneck. Bandwidth sharing issues may only arise when all those integrated peripherals are used simultaneously, but that seems well within the realm of possibilities with the board's audio, Ethernet, and Serial ATA peripherals.