New Mac G5

[Bizkitkid2001]

They claim its the worlds fastest PC. Does anyone have any benchmarks comparing this to the fastest amd and pentium 4?

[franklinz]

man i had a link showing that the comparison was rigged, but i cannot find it for the life of me.
ill keep searching and edit my post if i find it.
franklinz

*edit* didnt read it all but heres some links:
http://arstechnica.infopop.net/OpenT...4&m=3330955475

heres the one: http://www.haxial.com/spls-soapbox/apple-powermac-G5/

[EvilCrow]

They say it's a duel 2GHz, which means it's 4GHz.
You can overclock a P4 3.2GHz to just over 5GHz.

Apple is teh liar!

I hate to tell all you amd/intel based nuts but if you benchmarked a comparably equipped mac/apple system to anything that amd or Intel puts out you'd lose hands down no arguments. I'm not talking about overclocking any neither is apple, and even with that I'm not sure an apple/mac can't beat the pants off any high end p4 machine. If you oc'ed or could oc a power mac g5 {if its even pssoible} you'd totally kill the latest greatest from intel or amd

[goldenbuddha]

Originally posted by EvilCrow
They say it's a duel 2GHz, which means it's 4GHz.

Er, no, thats not how it works. a dual 2 ghz is still 2 ghz, not 4 ghz.

[EvilCrow]

Originally posted by goldenbuddha


Er, no, thats not how it works. a dual 2 ghz is still 2 ghz, not 4 ghz.

OK then...
Why are they saying it's the fastest personal computer??

they aren't I see no where that it says a 4ghz machine it sats dual 2ghz cpu's running at stock speeds of 1ghz fsb

[EvilCrow]

Originally posted by RicheemxX
they aren't I see no where that it says a 4ghz machine it sats dual 2ghz cpu's running at stock speeds of 1ghz fsb

Read my edited post.

read the facts on the machine and my post. It might not be the fastest overall machine after overclocking but if you benchmark it with any stock machine it would be. As I'm not aware of any overclocking of a mac machine I'd say if you could oc it it would be faster than any oc'ed intel machine. As I stated I'm not sure you can but if you could wow!!!

Your talking about a machine that runs stock on dual 2ghz with fsb of 1ghz and 1024 cache imagine the benchmark right out of the box on that. the fastest p4 can't touch it. I'm not saying you can't build a faster machine with the money..cause hey the price is but its a monster no matter what

and correct me if I'm wrong but the speeds on a dual cpu machine like this one run higher than 2x the cpu power??

[dunbar]

Originally posted by EvilCrow


OK then...
Why are they saying it's the fastest personal computer??

Computation is faster. Clocks are a big part, but totally not the whole story.
G2-G4 PPC (RISC) chips used a setup that kind of equates to the old math coprocessor setup for 80486 and lower - a second data processing area, sending instructions to the AltiVec chip.

On the G2-G4, only certain instructions are processed in the AltiVec, but the instructions that are processed are very complex ones that x86 chips do not farm out. As I understood the issue, the AltiVec chip would execute a routine in something like 1/4th the clock cycles of the main CPU. Hence, AltiVec makes PPC execute certain code with fewer clock cycles versus x86. So, if you send the CPU the instructions which AltiVec is going to process, you pick up speed.

I have not fully investigated the G5 - it seems to have silicon to handle the AltiVec routines (see Velocity Engine statement, below).
Oh, and 1GHz FSB??? That is wild!

G5 Architecture discussion

Fastest bus in the west
The G5 features a scalable design that enables it to run at clock speeds up to 2GHz. This represents a 600MHz jump, the largest in PowerPC history, over the fastest G4 processor at 1.4GHz. But all the megahertz in the world wouldn’t mean squat if the G5 were stuck talking to the rest of the machine at the 167Mhz bus speed of the Power Mac G4. That’s why the G5 features two unidirectional 32-bit data paths: one traveling into the processor and one traveling from the processor, unlike previous designs. Its frontside bus works at speeds up to 1GHz for an astounding 8 GBps of total bandwidth. That makes it 200MHz faster than even the latest Intel 875 chipset, which sputters out at 800MHz.

I know that the G3 CPU cards (for a Mac 7500 that I own) can be purchased with L2 cache of 2 megs.... Intel chooses to make low cached CPUs; usually 512k or less, for consumers.

Finally, the G5 isa 64 bit CPU, in a consumer box. nyaah nyaah.

G5 page at Apple

Apple collaborated with IBM to leverage this industry-leading design for the G5, combining an optimized Velocity Engine with a new superscalar, superpipelined execution core that supports more than 200 simultaneous in-flight instructions.

Ouch!