IBM's 90nm PowerPC 970FX

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Original poster
Apr 12, 2001
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IBM has posted the first official information of the PowerPC 970FX (90nm PowerPC) in this PDF entitled "IBM PowerPC Quick Reference Guide".

According to the document (page 10), the PowerPC 970FX is the 90nm version of the PowerPC 970. A comparison chart reveals that the 970FX consumes 24.5W at 2.0GHz while the original 970 consumes 51W at 1.8GHz. The 970FX speeds are only listed as 1.4-2.0+ GHz, however, revealing no information as to the top speed of the chip, though the Bus reaches 1.1GHz (vs 1.0GHz of the PowerPC 970).

The 90nm PowerPC is widely expected to power the next PowerMac revisions, and are currently being used the recently revised Xserve G5s. The 970FX was first referenced in this rumor report but few other processor details accompanied that report.
 

jderman

macrumors newbie
Dec 21, 2003
13
0
NY
10 W @ 1 Ghz is the current g4's power consumption. Clock that fx puppy down to 1.8 or 1.6 and your at about 16/18 watts. Beef up the battery in the current unit and wallah, you have a laptop with about a 2hr battery life that will make the g4pb look like a joke (performance wise). What do those 3ghz p4 laptops consume anyway?
 

Some_Big_Spoon

macrumors 6502a
Jun 17, 2003
855
0
New York, NY
G4 Power consumption

Don't quote me on this, but I remember reading that the G4 in the current powerbooks consumes 10W.. I'm sure Arn can give the actualy numbers.

Of this I'm sure, the 24.5W while impressive as all get out, is probably at least double the current PB.. So maybe not at that speed, BUT even if you put a 1.2GHz G5 in the PB you'd have a 600MHz bus anf the option to get some serious RAM in the box.. that alone would make the current PB's seem like calculators..


Originally posted by Bob Knob
For a reality check, how much does the chip in the current G4 PowerBook use?
 

Samurai980

macrumors newbie
Jan 21, 2004
9
0
Well it is nice to see IBM try to improve things, but why still such a low amount of L1, L2, and L3 cache?

The Pentium 4 was soundily defeated by the AMD 64 FX-51 (L1:128k,L2:1MB) and then Intel released the Pentium 4 Extreme Edition which is just a P4 with L1: 8k, L2: 512K, and a L3: 2MB and then it soundily defeated the AMD 64.

Now the PowerPC 970 has a measily 32K L1 and a tiny 512K L2. Why doesn't IBM/Apple upgrade this tiny thing? I mean there would be a significant speed and performance boost as a result.

Another interesting difference is the transistor count of the three processors. P4EE is 178m, AMD64 is 106m, and Apple is 58m.

Aside from that, Apple needs to put out a true 64-bit OS.
 

Mr Maui

macrumors 65816
Jul 19, 2002
1,152
0
Originally posted by jderman
10 W @ 1 Ghz is the current g4's power consumption. Clock that fx puppy down to 1.8 or 1.6 and your at about 16/18 watts. Beef up the battery in the current unit and wallah, you have a laptop with about a 2hr battery life that will make the g4pb look like a joke (performance wise). What do those 3ghz p4 laptops consume anyway?

I was just wondering about the power consumption ... thanks. But, I can honestly say that as a traveling professional two hour battery life will never cut the mustard. It burns 12.5 watts at 1.4 Ghz, plus with chip enhancements of the G4 should in itself blow out the present G4s, and have decent battery life. That's my two cents ... <but still have a pocket full of change ... LOL> :rolleyes:
 

Mr Maui

macrumors 65816
Jul 19, 2002
1,152
0
What is the wattage consumption of the current 1.3 GHz?

Spec sheet for the 970 FX says it consumes 12.3w at 1.4 GHz and 24.5w at 2.0 GHz.

<change pocket is draining slightly>
 

Frobozz

macrumors 65816
Jul 24, 2002
1,134
69
South Orange, NJ
Laptops

The first thing I noticed was how relatively little wattacge is consumed by these chips. In turn, I immediately think of G5 Laptops.

Personally, I'd rather take a dual 2.6 Ghz G5 Desktop than a 1.6 Ghz - 1.8 Ghz laptop because of the type of daily tasks I go through. But a laptop sure would be nice, and I'm not looking to replace a desktop with it.
 

Booga

macrumors regular
Aug 8, 2002
122
0
Performance numbers

If you compare the performance numbers, the 970FX is a bit slower per MHz for SPEC numbers than the original 970. Although this is usually the case as the processors get faster clocks, it's kind of unfortunate to see.

It lists a 1.8GHz 970 as 828 SPECint2K and 1036 SPECfp2K. The 970FX at 2.0GHz (which is 1.11x faster in clock) gets 890 (1.07x) and 1100 (1.06x). It makes me wonder how it will scale into the 2.4+ GHz range.

On the other hand, cutting the power consumption in half is pretty sweet. 25W is very respectable at 2GHz! Plus, it is rated to operate hotter than boiling water :)
 

Sabbath

macrumors 6502a
Sep 18, 2003
534
0
London
12.3 watts that must be do able surely. But then again isnt that just the processor? I dont know how much heat the buses would pump out at the necessary higher clock speeds?
 

Mr Maui

macrumors 65816
Jul 19, 2002
1,152
0
Just found a spec sheet for the 7455 at 1GHz and it says the typical consumption is 15w. Does that seem right?

Seems pretty high if the 1.4GHz G5 is only requiring 12.3w.

Any thoughts?
 

me_17213

macrumors newbie
Mar 12, 2003
6
0
the MIPS on te older 970 is alot higher than the FX version, I'm wondering wh the diffference would be so much.

970 1.8 7584 MIPS

970FX 2.0 5800 MIPS

Anybody care to fill me in?
 

csubear

macrumors 6502a
Aug 22, 2003
613
0
Originally posted by Samurai980
Well it is nice to see IBM try to improve things, but why still such a low amount of L1, L2, and L3 cache?

The Pentium 4 was soundily defeated by the AMD 64 FX-51 (L1:128k,L2:1MB) and then Intel released the Pentium 4 Extreme Edition which is just a P4 with L1: 8k, L2: 512K, and a L3: 2MB and then it soundily defeated the AMD 64.

Now the PowerPC 970 has a measily 32K L1 and a tiny 512K L2. Why doesn't IBM/Apple upgrade this tiny thing? I mean there would be a significant speed and performance boost as a result.

Umm... 512K L2 cache tiny? 32K L1 tiny! i don't think so. yes L3 cache is nice, L2 is imporant.. but L1 is the most imporant. That is where the cpu is directly getting data. Now from what you said the ppc970 has 4 times as much L1 cache then the P4. What does that mean. Less cache misses, less main memory access, and less stalled pipelines.
 

jderman

macrumors newbie
Dec 21, 2003
13
0
NY
Whats really important here is that now we know for sure that a g5 pb *can* be produced and that it would be a practical machine (It woulden't be by any measure with the 970)


oops almost forgot speed bumps for the desktops. BringemonAPPL.
 

wizard

macrumors 68040
May 29, 2003
3,854
571
They willprobally go with a 3x multiplier. That would put us at 3.3 GHz.

On the other hand they could have some info embargoed.

What is most interesting is the 1.4 GHz wattage, I wonder if that is average or max. Further I do hope that they have done some work on the system controller as we are talking almost 30 watts there. A 64 bit laptop would be neat but I do hope that a 970 is worthwhile at these speeds.

Dave

Originally posted by RalphNumbers
1.1Ghz bus implies 2.2Ghz CPU clock

lets hope that isn't the upper limit for this revision.
 

nighthawk

macrumors regular
Jan 3, 2003
104
0
Originally posted by csubear
Umm... 512K L2 cache tiny? 32K L1 tiny! i don't think so. yes L3 cache is nice, L2 is imporant.. but L1 is the most imporant. That is where the cpu is directly getting data. Now from what you said the ppc970 has 4 times as much L1 cache then the P4. What does that mean. Less cache misses, less main memory access, and less stalled pipelines.
I am not disputing anything you say, but I just wanted to add something in the mix here...

The Pentium is only a 32-bit chip, so when the 970 is running in full 64-bit mode, it only has the equivelent of twice the cache. I agree that the L1 cache size could be improved.

Also, the data cache is only 32kb, the instruction cache uses a separate 64kb. The spec sheet for the P4 Extreme does not list a separate amount for instruction cache. I believe that this is one of the weaknesses of the x86 architecture -- it does not include a separate cache for instruction data. (Correct me if I am wrong, but isn't this the source of the data buffer overrun error that plagues PCs?)

In addition, the P4 Extreme's L3 cache is running at 800mhz or 1/4 the speed of the processor. I could not locate the speed of the L1 and L2 for the P4e, but IBM explicitly states that both the L1 and L2 cache runs at the full processor speed. The data-sheet for the P4e does describe the two ALU (integer calcs) as running at "twice the core clock" which is 1600mhz for the P4e. This is also unlike the 970xx which runs at the full clock speed.

If Apple can release a Dual 2.6ghz in a few weeks, then Mac users can truely brag about the fastest personal computer.

Details on P4 Extreme are from here:
http://www.intel.com/products/desktop/processors/pentium4HTXE/
 

wizard

macrumors 68040
May 29, 2003
3,854
571
Don't underestimate the importantce of cache. Not only can you increase performance but you can cut averge power usage.

A larger cache could be very important if this chip ends up in a portable as they are very likely to cut e-bus speed to save power. Slow your interface bus down and we will all be wishing for more cache.

Dave



Originally posted by csubear
Umm... 512K L2 cache tiny? 32K L1 tiny! i don't think so. yes L3 cache is nice, L2 is imporant.. but L1 is the most imporant. That is where the cpu is directly getting data. Now from what you said the ppc970 has 4 times as much L1 cache then the P4. What does that mean. Less cache misses, less main memory access, and less stalled pipelines.
 

jj2003

macrumors newbie
Aug 30, 2003
28
0
Finland
Originally posted by me_17213

970 1.8 7584 MIPS
970FX 2.0 5800 MIPS

Anybody care to fill me in?
I know nothing, but I would take that as a typo. A linear scaling from 1.8 to 2.0 gives us almost 8500, true that the spec numbers do not scale linearily, but that looks quite weird.
 
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