Frequency, Bus speed, rated FSB ...cpu-ram memory ?
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From: Paul on 9 Dec 2008 02:19 Majki Majk wrote: > Thanks for motherboard and processor review. It's nice to know how it > works alltogether, ok the experience makes a part of its own. So this > Bus speed is like a backbone through which operations are dealt ? > So if as, then my backbone of 100mhz Bus speed is a weak beackbone or... If you know the name of your chipset http://www.intel.com/products/notebook/chipsets/915gms/915gms-overview.htm you can get a block diagram for it from the Intel site, like this. http://www.intel.com/Assets/Image/diagram/915gms_diagram_760.gif In that example, the DDR2 memory at DDR2-400, gives 3.2GB/sec max. The FSB is FSB400, and since the FSB is 8 bytes wide, it also transfers at 3.2GB/sec max. So that laptop chipset is balanced. There is a small amount of performance to be gained by changing the clock, but it would not represent a major improvement. (Perhaps a few percentage points.) And if the BIOS will not allow a setting of DDR2-533, it may not be possible to experiment. Post the name of the chipset listed in CPUZ, so I can look it up. In your initial posting, I didn't see the chipset name. I know you have a Pentium-M 755, but the chipset is probably something more recent than an 855GME. Paul
From: Majki Majk on 10 Dec 2008 23:10 Paul wrote: > Majki Majk wrote: > >> Thanks for motherboard and processor review. It's nice to know how it >> works alltogether, ok the experience makes a part of its own. So this >> Bus speed is like a backbone through which operations are dealt ? >> So if as, then my backbone of 100mhz Bus speed is a weak beackbone or... > > If you know the name of your chipset > > http://www.intel.com/products/notebook/chipsets/915gms/915gms-overview.htm > > you can get a block diagram for it from the Intel site, like this. > > http://www.intel.com/Assets/Image/diagram/915gms_diagram_760.gif > > In that example, the DDR2 memory at DDR2-400, gives 3.2GB/sec max. > The FSB is FSB400, and since the FSB is 8 bytes wide, it also > transfers at 3.2GB/sec max. So that laptop chipset is balanced. > There is a small amount of performance to be gained by changing > the clock, but it would not represent a major improvement. (Perhaps > a few percentage points.) And if the BIOS will not allow a setting > of DDR2-533, it may not be possible to experiment. > > Post the name of the chipset listed in CPUZ, so I can look it up. > In your initial posting, I didn't see the chipset name. I > know you have a Pentium-M 755, but the chipset is probably > something more recent than an 855GME. > > Paul Chipset is i915GMS/i910GML according CPUZ and as Northbridge says: Intel Alviso-G i915 Southbridge: Intel 82801FBM ICH6-M I saw numerous bioses, and this one doesn't have many open functions to play with.. mm
From: Paul on 11 Dec 2008 00:45 Majki Majk wrote: > Paul wrote: >> Majki Majk wrote: >> >>> Thanks for motherboard and processor review. It's nice to know how it >>> works alltogether, ok the experience makes a part of its own. So this >>> Bus speed is like a backbone through which operations are dealt ? >>> So if as, then my backbone of 100mhz Bus speed is a weak beackbone or... >> >> If you know the name of your chipset >> >> http://www.intel.com/products/notebook/chipsets/915gms/915gms-overview.htm >> >> >> you can get a block diagram for it from the Intel site, like this. >> >> http://www.intel.com/Assets/Image/diagram/915gms_diagram_760.gif >> >> In that example, the DDR2 memory at DDR2-400, gives 3.2GB/sec max. >> The FSB is FSB400, and since the FSB is 8 bytes wide, it also >> transfers at 3.2GB/sec max. So that laptop chipset is balanced. >> There is a small amount of performance to be gained by changing >> the clock, but it would not represent a major improvement. (Perhaps >> a few percentage points.) And if the BIOS will not allow a setting >> of DDR2-533, it may not be possible to experiment. >> >> Post the name of the chipset listed in CPUZ, so I can look it up. >> In your initial posting, I didn't see the chipset name. I >> know you have a Pentium-M 755, but the chipset is probably >> something more recent than an 855GME. >> >> Paul > > Chipset is i915GMS/i910GML according CPUZ > and as Northbridge says: Intel Alviso-G i915 > Southbridge: Intel 82801FBM ICH6-M > > I saw numerous bioses, and this one doesn't have many open functions to > play with.. > > mm So this should be pretty close to your architecture. http://www.intel.com/Assets/Image/diagram/915gms_diagram_760.gif Page 25 of the datasheet gives an overview. (FSB400, single channel DDR2-400) http://www.intel.com/Assets/PDF/datasheet/305264.pdf On PDF page 292, section 10.14.3.2, it shows only one set of operating conditions for the FSB and memory on the 915GMS. While there are likely to be ways to overclock everything at the same time, the question would be how overclockable the 755 processor is, especially if you cannot bump up Vcore. (Two examples of ways to overclock, would be a hardware BSEL style mod to change what the clock generator delivers for an input clock. Or to use a program such as SETFSB, which modifies the clock generator settings while in Windows. Not all clock generators are supported by that program. It works on my current motherboard.) http://www13.plala.or.jp/setfsb/ Based on some of the other sections of the Intel specification, my guess would be that chipset was selected to give as long a battery life as possible. That is why it only has single channel memory, as each memory channel increases the load on the battery. A "desktop replacement" style of laptop, has more room for burning up power, and the laptop designer could select dual channel, more powerful separate GPU and so on. Paul
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