![]() ![]() Enable AMD Cool 'n' Quiet on a very hot running SR1550NX Athlon 64. Enable AMD Cool 'n' Quiet on a very hot. And you activate CnQ. With the Cool n Quiet. AMD's Cool'n'Quiet: Disable it One interesting phenomenon that we encountered during testing on the AMD/NVIDIA platforms with the Phenom series of processors is the effect of Cool’n’Quiet (CnQ) on our BD playback results. We utilized a Phenom 9950BE in our test results today along with the 780G/GF8200/790GX chipsets. When playing back our H.264 title, The Simpsons Movie, with CnQ disabled we noticed an average CPU utilization of 6%~7% with platform power averaging anywhere from 132W to 140W depending on the chipset and motherboard. ![]() If you are not shooting for a high overclock you can still use cool & quiet many do, but when you are after closer to 4ghz, C&Q will limit you. Disabled 'Cool N' Quiet' and all is well! Technical Support. I set my CPU minimum speed to 100%, thus disabling Cool N' Quiet in Windows Vista or 7. Video playback was smooth and stutter free on this title and many others regardless of the encoding format utilized. One of the prime objectives for our HTPC systems is energy saving, especially during playback operation - the idea being that lower power use produces less heat and should therefore also result in a quieter system. ![]() The quickest way to reduce platform power on an AMD based system is to enable CnQ. After enabling CnQ in the BIOS and setting our Vista power management profile to balanced or power saver, we noticed our platform power requirements dropped to 99W~112W. This is a 25% or so improvement in power savings so we were naturally pleased with the results. We fired up Power DVD 8 Ultra, popped The Simpsons Movie back in and decided to see how well the system operated. Our CPU utilization numbers increased to 16%~23%, but considering our processor and lack of background activities, this increase was perfectly acceptable. At least until we sat through this movie and others. We started to notice slight stutters, pauses, and even some judder at various times during the movie. At times, it was very pronounced but other times it was very subtle, but it was not so subtle that we did not notice. The most frustrating part is that it never occurred in the same section of a title or at the same time. ![]() We would notice stuttering in the first 30 seconds of a title at times and other times it would not occur at all. In every case with CnQ enabled, we eventually noticed this behavior, regardless of chipset on the AMD platform. Turning off CnQ resulted in an immediate improvement in our viewing experience. We are investigating this problem (actually it has occurred in the past on the Athlons but not to this extent), but until then our suggestion is leave CnQ off and suffer the consequences of increased power usage. (Or at least, leave it off if you're putting together an HTPC.). 40 Comments • - Monday, January 12, 2009 - A fair comparison? Don't think so! A AMD processor with a 140 Watt TDP and a Intel processor with a 95 Watt TDP?? I wonder why the intel chipsets seem more power efficient? If you are testing the performance, ok seems fair, but power efficiency should be measured with two processors with the same TDP. I am convinced that if you did the same test with a AMD 4850E the AMD would beat the crap out the intel versions on power consumption. But yet again, that would not be fair. So keep in mind that this review is not to be taken al to seriously! • - Tuesday, October 28, 2008 - Hi, what amazes me is that it seems no reviewers of the AMD IGP chipsets have caught the serious 2D issues referred to here: '> However, the only channel that we consumers / mere mortals have to put pressure on AMD is to send feedback to the Catalyst team. Nothing seems to get done and there is not even any acknowledgement that this issue exists across the HD3200/HD3300 IGPs no matter which manufacturer. The 3D performance is hyped up and that's all very well when the chipset has shown that it can deliver, but in fact many users will spend a lot of time on 2D activities which truly suck. This makes a lot of users regret their purchase. What the renowned sites such as anandtech and tomshardware can do is try to reproduce the issues, then use their direct contacts to try to see if this issue is being addressed and update the parent article accordingly. Is it possible? GM - Hong Kong. • - Tuesday, October 14, 2008 - Really, this thing came out like 6 months ago it seems and finally we get some video benchmarks on anandtech. I know it has been commented that it did not work right for months because the video drivers were terrible but I can not believe it really took that long. When I had to get a HTPC, I just bought an Athlon BE and a 780G board. Much cheaper and adequate. Which in hindsight the P45 may have performed better, an Intel CPU and a Core 2 CPU would have driven the price up quite a bit.
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