Moving Memory Rate |
September, 23, 2003 11:13 AM |
lyonsdj88 |
Thinking of upgrading to a faster CPU for my 8600 w/G3 450 Just like to know how much Memory speed would increace? Right now I get 45/MBs and for most things the Memory is the bottle neck. So, those of you with 500mhz+ G4's or 800-900mhz G3's could you use GagePro to check your MMR and post it here.Also please post you Bus speed. Thanks in advance. |
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Marty |
September, 27, 2003 10:58 AM |
lyonsdj88 |
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Got any Games to benchMark that G3/900? |
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RE: Moving Memory Rate |
September, 25, 2003 10:14 PM |
chibi_delenn |
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lyonsdj88, My bus speed is 50 Mhz, with a G4/400 (8x multiplier), and a Radeon R7200. I know that with a 604e/250 you get about 34 MB/sec throughput, a G3/300 jumpes to 55 MB/sec (G3/400 gets about the same), and the G4/400 I use gets me 87.6 MB/sec, so what I'm figuring between 604e and G3 is that the L2 Cache is what makes the memory throughput increase there. Going from G3 to G4, it isn't Altivec that does it, as Gauge Pro uses no SIMD calls, but instead the G4's far beefier FPU. It's either that or the way the G4 is pipelined. But the increases are very real. Have Gauge Pro kill all other processes, and do the RAM tests. Let's say you have 512 MB RAM. On the G3, it will take about 8.5 to 9 seconds to complete a single read or write pass. On the G4, it would take only 6.5 seconds to complete. Games that were unplayable for me (Elite Force, Q3A) with the G3/400 are suddenly playable now with the G4/400. That tells me that not only has the memory throughput gone up, but that many apps are being stymied by the G3's relatively low bandwidth (the 750FX might have a G4's bandwidth though, not sure as I've never used one). - Chibi Delennâ„¢ |
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RE: Moving Memory Rate |
September, 25, 2003 5:48 PM |
lyonsdj88 |
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Chibi, what bus speed are you running? Anyone got Q3A timedemo four FPS or JK2 timedemo jk2ffa FPS. With radeon7000 and G4's with 50+ MMR. Thanks folks, hard to find any info on how these newer upgrade cards do as the G4 Tower CPU upgrades are cheap and no one wants to bench old pci mac's anymore :-( BTW how can the MMR keep getting higher with the bus/clock speed? I thought that this old EDO FPM ram was 60ns or 70ns witch is set by a chip on the ram itself. What would 60ns be in MHZ about 14mzh or so. Maybe 50-55 MB/s max. Not that I don't belive the #'s you are putting up as I have seen lots-o-bench-marks with scores over 60MB/s , I just don't understand how memory works???????????????? |
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RE: Moving Memory Rate |
September, 23, 2003 11:13 PM |
chibi_delenn |
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Gauge Pro ran just fine for me when I had the G4/800 card working (for all of the two days it did, BG). I had 106.5 MB/sec rates for that. I get 87.6 MB/sec right now on a G4/400 ZIF on my CarrierZIF MPe. Not sure if the Mach Velocity board will increase that at all (that's what I'm trying in the next two days when I get the XLR8 HS/F setups that are being mailed to me - gotta love having two G4/400 ZIFs). The benefit is definitely real, as the memory throughput rate is incredibly CPU bound on old macs. It's bus bound too, but the CPU is a real bottleneck with regard to G3 vs. G4. G3/400 ZIF = 58 MB/sec. G4/400 ZIF -- 87.6 MB/sec. Very noticeable in games for sure. - Chibi Delennâ„¢ |
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RE: Moving Memory Rate |
September, 23, 2003 10:21 PM |
lyonsdj88 |
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I've seen score's in the 80 MB/s range posted,but they were from a few years back. Just wanted to see if the newer upgrade's did any better. Thanks for taking the time to reply. |
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RE: Moving Memory Rate |
September, 23, 2003 2:53 PM |
marcush |
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With my Power Tower Pro, Sonnet G4 800 and 1GB RAM in Xbench I get 137MB/s in what I believe is the moving memory equivalent memory test. What I singled out is the Fill test for Altivec. Gauge Pro under OS9 does not work with the Sonnet G4 800. However, my Xlr8 G4/450 SSE gave me 76MB/s moving memory scores in OS9. So the benefit is real. You can see the benefits in 3D games in particular. This was with the G4/450 card running at stock speed and 50Mhz bus. |
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RE: Moving Memory Rate |
September, 23, 2003 12:56 PM |
mjoecups358 |
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I don't think that test is so useful, and I don't think you will ever see #'s much above 50M per second on old world macs... GagePro doesn't run under OSX, so perhaps if I get time late I will try it on my new toy the G3/900 zif. Marty |