I am having a problem with a system I built recently. When playing games such as CC: Generals and Planetside, the system will randomly hardlock (screen freezes, sound system makes a horrible screeching noise and then loops the most recent audio about 2 seconds back, or sometimes no audio at all) and the only way to get out of it is to hit the reset button on the case. I have NEVER had a crash when doing normal operations such as web browsing or word processing or playing mp3's. My system specs are: - Asus P4C800 Deluxe - Intel P4(C) 2.6ghz (Thermaltake A1545 P4 Spark 7 for cooling) - Corsair TWINX512-3200LL 512MB DDR400 XMS3200 Ultra Low Latency Dual-Channel Memory - ATI Radeon 9600 PRO - Creative Labs SB Audigy 2 - Western Digital Caviar WD1200JB - Antec TruBlu 480 watt PSU - Windows XP (Pro) Now, originally I though it was an overheating issue, so I picked up the Thermaltake CPU cooler, and the case now has two 120mm fans (one suck, one blow) and a pci slot fan next to the ATI card. At idle, my cpu and mobo are at about 75 degrees, under load, they never exceed 105 degrees. I also thought it may have been the audio subsystem on the mobo causing it, so I installed the Audigy 2. No help there. I assume it must be a memory issue. My friend built a system that had an Asus mobo that used rambus memory, and he found that it was extremely picky about what brand of memory it used. I have tried running memtest86 and the program has never completed all the tests. It always crashes, but always at different spots of different tests. I thought I saw a post on here a while ago that said Kingston HyperX memory worked well on Asus boards. I wanted to check with you guys, to see if there is anything else I overlooked before I went and bought a gig of memory (I might as well upgrade right? ) To sum up: - Any other causes for the hardlocks? - Any known compatibility problems with Asus/Corsair or Asus/Kingston - Can you believe how long this post is? I have learned alot from this board...any help would be greatly appreciated.