kday Posted July 15, 2006 Share Posted July 15, 2006 I put together a osx86 rig with a Pentium D 920 cpu. When I boot to OS X, the system profile says 4 ghz! Is it really running at 4 ghz? I wanted to overclock this sucker to 4 ghz anyway since I have a badass HSF, but I thought I couldn't do that with an intel board. Could there be a bug where the motherboard is determining the wrong FSB speed? I know when you up the FSB with other motherboards, you can reach 4 ghz. Here is what sysctl returns about my cpu: machdep.cpu.brand_string: Intel(R) Pentium(R) D CPU 2.80GHz machdep.cpu.model_string: Intel Pentium 4 machdep.cpu.family: 15 machdep.cpu.model: 6 machdep.cpu.extmodel: 0 machdep.cpu.extfamily: 0 machdep.cpu.feature_bits: -1075053569 58429 machdep.cpu.extfeature_bits: 537919488 1 machdep.cpu.stepping: 2 machdep.cpu.signature: 3938 machdep.cpu.brand: 0 machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM SSE3 MON DSCPL VMX CX16 TPR machdep.cpu.extfeatures: XD EM64T machdep.cpu.logical_per_package: 2 machdep.cpu.cores_per_package: 2 hw.byteorder: 1234 hw.memsize: 2147483648 hw.activecpu: 2 hw.physicalcpu: 2 hw.physicalcpu_max: 2 hw.logicalcpu: 2 hw.logicalcpu_max: 2 hw.cputype: 7 hw.cpusubtype: 10 hw.pagesize: 4096 hw.busfrequency: 800000000 hw.busfrequency_min: 800000000 hw.busfrequency_max: 800000000 hw.cpufrequency: 2800000000 hw.cpufrequency_min: 4000000000 hw.cpufrequency_max: 4000000000 hw.cachelinesize: 64 hw.l1icachesize: 12288 hw.l1dcachesize: 16384 hw.l2cachesize: 2097152 hw.tbfrequency: 1000000000 hw.optional.floatingpoint: 1 hw.optional.mmx: 1 hw.optional.sse: 1 hw.optional.sse2: 1 hw.optional.sse3: 1 Oh, I also got the latest firmware update (released a few days ago) for my mobo. I never noticed the system profiler saying 4 ghz before that. I'll see if I can downgrade my firmware to see. Update: I guess the OS is just returning the wrong value. I booted to Windows XP, and it said it was running at 2.8 ghz. The FSB seems normal. Link to comment Share on other sites More sharing options...
bliss Posted July 15, 2006 Share Posted July 15, 2006 yes its on mine, too. i think osx just got it wrong. maybe theres 4 ghz because the mb supports up to 4 Ghz processors... Link to comment Share on other sites More sharing options...
bofors Posted July 15, 2006 Share Posted July 15, 2006 Update: I guess the OS is just returning the wrong value. I booted to Windows XP, and it said it was running at 2.8 ghz. The FSB seems normal. The other you may notice is that SSE3 is missing from the description list of the CPU. This does not mean that SSE3 is being emulated. Both the 4 GHz issue and the SSE3 issue are well known here. Link to comment Share on other sites More sharing options...
Superhai Posted July 16, 2006 Share Posted July 16, 2006 It is because how the cpuid string is different from the core duo cpus. It is usually the max frequency which is recognized. Link to comment Share on other sites More sharing options...
relik Posted July 20, 2006 Share Posted July 20, 2006 I have a similar problem except that my 'About This Mac' windows shows I'm running at 4.30 GHz when my processor is only 3 GHz. It doesn't stop there, if I click on my 'More Info...' button; it shows my CPU speed as 42.45 GHz!!! Thats crazy! And yes it looks like SSE3 is missing from the CPU features list. Another weird thing is that this only happens part of the time. After a restart, my computer will either display all info correctly and work perfectly. Sometimes however, it'll display that bogus info and any graffical effects will run really sluggish. My dock for example as well as opening new windows, menu transparencies and expose to name a few are SLOOOOOWWW. You'd figure they would be running even faster if my CPU indeed was running at that higher speed! Anyway, I take it there's no known fix for this as you say is a well known issue. I'm spaking new to the forum so I have no idea yet whats common knowledge and what isn't. Any help would be appreciated! Thanks guys! Link to comment Share on other sites More sharing options...
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