Final notes on noise, power, and temps...
I measured power using a Kill-a-Watt, CPU temps and fan speed with the ASUS PC Probe II, and GPU temps with Catalyst Control Center.
I can't get GPU fan speeds. GPU-Z 0.2.8 doesn't recognize the Sapphire card, and CCC doesn't report GPU fans speed, only fan %.
I can't measure northbridge temps. The only other temperature sensor on the ASUS MB is a "MB" sensor that seems to be more of ambient case temp.
All performance and cooling settings are stock. ASUS Q-Fan and AMD Cool and Quiet are enabled.
I first ran without the HD 4830 to get a baseline.
Without the HD 4830, the noise is from the PSU fan and stock CPU cooler only. Both are about the same sound level at CPU idle and fairly quiet, although certainly not silent. If you're familiar with a stock AMD CPU fan running at 2300 RPM, then that's about what the PSU sounds like.
Overall, it's very quiet by normal PC standards. The IN WIN product page claims 30dB at idle with a low-power Intel CPU and power saving features. I don't have any way to measure my setup, but it must be about the same using the 4850e, C&Q and Q-Fan.
For general use, it's not intrusive, even sitting on the desktop. In a quiet setting, it is audible so for HTPC use, I would probably look into fan swaps to try to quiet it down just a little. For a cheap, stock case it's great though, especially if you need room for full-height cards.
The Caviar Green drive is also great. If you get within 2 feet and concentrate, you can hear it over the fans, but it's hardly noticeable. It's hard mounted in this case. A foam pad or suspension mount would probably make it inaudible over the fans.
The LG drive I used (GH22NS30) is fine overall. At times the seeks seem nosier than the other drives I have.
The power measurements are very similar to those reported here in the SPCR review of the Gigabyte GA-MA78GM-S2H.
I've got 4GB RAM, so some of the power readings reflect a few extra watts compared to the Gigabyte setup reviewed.
Measured Power/Temps/Speeds (IGP only)
Power CPU temp CPU fan
Idle 43W 29C 2250 rpm
CPUBurn only 101W 48C 3050 rpm
CPUBurn + ATITool 111W 49C 3050 rpm
Next I installed the Sapphire HD 4830. Sapphire used their own cooling design. The good news is, it's much better at cooling than the ATI reference design. The bad news is it's apparently much louder at idle.
At idle, the Sapphire fan is much louder than the PSU or CPU fan. With the Sapphire installed, the overall noise level is no longer "quiet" but more like "on the quieter side of average". This is very different from the almost unnoticeable effect of the ATI 4830 at idle reported here in the SPCR review.
The GPU temps are also much different, however.
Measured Power/Temps/Speeds (With Sapphire HD 4830)
Power CPU temp CPU fan GPU temp
Idle 65W 29C 2250 rpm 39C
CPUBurn + ATITool 165W 47C 3000 rpm 58C
Compare to 55C idle/85C load for the ATI card.
Ironically, I'm in the opposite situation as many HD4800 series owners. I'd like to give up a little idle cooling for less fan noise. Unfortunately, the manual fan control in Catalyst Overdrive do not allow reducing the stock fan speeds, only increasing.
The 165W (input) total is well within the PSU 300W (output) rating. Even assuming all that power goes to one 12v rail output, it's also well under the PSU 12v capacity and a 20A rail current limit.
A side note on the Sapphire - the driver support seems to be lagging. I didn't see the manual fan control option in Overdrive until I just updated to the new 8.11. It wasn't there in 8.10 for this card. I also had to manually select the 8.11 4800 series driver for installation by Vista. For some reason, it didn't install automatically.
Part of the issue may be that the Sapphire card (and apparently the HIS 4830 card) reports the GPU as "944C" rather than RV770. This also confuses GPU-Z.
Overall, I really like the Mt. Jade case. It's a cheap, quiet, compact case. The PSU looks small on paper, but has plenty of power for my configuration plus some headroom for another expansion card or a mid-power Phenom in the future.
The Sapphire HD 4830 is a great card for moderate gaming on a budget. It's better cooled than most 4800 series, and from reviews seems to overclock better than most 4830s. The cooling comes at the cost of increased noise, particularly at idle. For my purposes, that's OK. If you're more concerned about noise than GPU temps or overclocking, then look into other versions of the 4830.