Overclocking a previous overclock.

[Grminalac]

I have been trying to squeeze every last bit of performance out of my PIII 550 overclocked to 733 on a Gigabyte GA-6VX-4X; unfortunetly my system refused to run stable at any speed faster than a 133FSB with my memory on a CAS3 setting. This really made me mad because at the CAS3 setting my memory benchmark really took a hit. I then went ahead and broke down and bought a stick of mushkin PC133 rev 2. Now I am pleased to say my system is stable. (I have run both quakeIII and RC5 for 3 days straight, well quake ran when I was not on, but RC5 was constant.) I have noticed an incredible jump in performance.
BEFORE:
Corsair PC133 CAS3 PIII 733. FSB 133
Sandra Benchmarks
CPU: 345 FPU: 417

AFTER:
Mushkin PC133 rev 2 (2,2,2) PIII 836. FSB 152 High perfomance setting enabled in BIOS.
Sandra Benchmarks
CPU: 424 FPU: 516

I can see the difference especially in quake III, i did a lot of testing but I won't bore everyone with the results.

 

[squirrel dog]

Thats a good o/c for the 550.What is your cpu temp?Reason I ask is that I have two p2 cels,633,and at 950 they are at 98-104f.I ran a 300a@450 at 114f for two years,so I am not that concerned,but if I could lower my cpu temps,I would like to.

 

[OuranosEXX]

well what mobo r u using? i used to have an via mobo and running my cpu at 853 (5,5 *155) but via mobos have really super bad memory perfomance, so i chanced it back with my 2years old bx mobo plus a asus slocket which gies me voltage regulators (bx mobo doesn't support coopermines). so enen now it runs at only 770 (5,5 *140) my system has is 10%-25% (even 50%faster on video editing) faster than before. and ithink u r realyy unlucky with your ex- pc133 ram, i use 2 stick of 128Mb one is 7,5ns pc133 and the other one is 8ns pc100 ram both running at 140Mhz with cas2 and precharge 2 very very stabe (i have a crash about once on 3-4 days and tahts after hour of gaming) .

 

[Grminalac]

Squirrel dog, my temp hovers around 92 F, at least thats the reading I get from the internal sensors on my motherboard. The system seems very cool though. My friend has a Celeron oc'ed to 800 and his runs super hot. His temp readings hover around 114 and is noticably toasty when you run your hand by the heatsink. That seemed very high to me, but before I overclocked his system it ran at about 120 F at the factory speed of 533; no kidding, but that was also before I replaced the thermal tape with heat transfer grease.

Ouranos my motherboard is Gigabyte GA-6VX-4X, I found it to be about the best motherboard avalable using the VIA Apollo Pro 133A chipset. (At least in reference to memory bandwith) Although the BIOS does not feature a lot of options, it has a toggle to enable/disable top performance memory setting. (which ghosts out the ability to select your own memory speed, automatically selecting 2,2,2 and it enables 4-way interleave) Come to think of it I do believe my old memory was stable using just CAS2, but not with the top performance setting enabled, and without that setting my memory performance was dismal; so just for stabilty sake I gave up the 6 point gain in bandwith and ran it at CAS3.
I had run the old memory for some time overclocked using the top performance setting, as it seemed to be stable, but after I installed windows 2000 pro I recieved BSOD every time I would defrag. The problem cleared up after i changed my setting to CAS3. Consequently the new mushkin memory running at 152 CAS2 Top Performance enabled, seems to deliver incredible memory bandwith as well as stability I have not had any problems thus far. In fact my system actually seems to run more stable than before, especially in quakeIII.

 

[Grminalac]

By the way what king of sandra memory benchmarks are you guys getting?