Core i7 Dissected and Benchmarked! Does Intel’s Next-Generation Chip Live Up to the Hype? Hell Yeah!
Budget Processor Showdown: Core 2 Quad vs. Core i7
It is no longer politically correct to call your thrift-minded friends by any of the many offensive low-cost names people have used over the years, but you can forward your cheap-skate geek friends this link and tell them that even they can participate in the latest technology trends without feeling like they’re getting a great deal. That’s because Intel’s new 2.66GHz Core i7-920 is a great deal.
To find out how well the 920 would do, we put the $284 chip against the $316 2.83GHz Core 2 Quad Q9550. The upshot is in almost every benchmark, the 920 was faster. In some tests, the slightly clock speed advantage of the Q9550 put it ahead, but not by much. Oddly, we did see the 920 lose in Quake 4. Quake 4 is only optimized for quad core but we didn’t expect to win here. Clearly there’s something going on the gaming side that we’ll have to continue to investigate. We must also point out that our decision to limit the Core i7 to its stock DDR3/1066 speeds may also be hobbling the chip.
Our recommendation is that you go with the path of the Core i7 chip if you’re concerned about future upgrades. With Core i7 here, Intel is likely to rapidly push the Core 2 platform aside so you’ll never see a CPU faster than the 3.2GHz Core 2 Extreme QX9770. The Core i7,l however, will continue to climb in clock speeds for the next few years. Where the Core 2 platform plays better is in the ultra budget shoppers. With Core 2 boards priced from $50 on up and CPUs in the sub $100 arena, you can actually start at far lower prices than Core i7. But if you are concerned about upgrades, the Core i7 is the way to go.
Benchmarks
| |
2.8GHz Core 2 Quad Q9550 ($316) |
2.66GHz Core i7-920 ($284) |
| MainConcept (min:sec) 3 |
27:40 |
21:40 |
| MainConcept Pro (min:sec) |
16.28 |
12.21 |
| ProShow Producer 3.1 (min:sec) |
15:18 |
11:10 |
| Premiere Pro CS3 (min:sec) |
12:51 |
12:39 |
| Photoshop CS3 (min:sec) |
2:04 |
2:05 |
| Cinebench 10 32-bit |
10,837 |
12,632
|
| Cinebench 10 64-bit |
12,288 |
15,217 |
| Valve Map Compilation (min:sec) |
2:10 |
2:32 |
| ScienceMark Overall |
1,715.67 |
1,710.1 |
| ScienceMark Membench (MB/s) |
7,105 |
12,737 |
| PCMark Vantage x64 Overall |
5:945 |
6,616 |
| PCMark Vantage Overall |
5,460 |
5,347 |
| Sisoft Sandra RAM Bandwidth (GB/s) |
6.9GB/s |
18.07GB/s |
| Sisoft Sandra RAM Latency (ns) |
81ns |
79ns |
| Everest Ultimate MEM Read (MB/s) |
8,006 |
14,449 |
| Everest Ultimate MEM Write (MB/s) |
7,075 |
11,627 |
| Everest Ultimate MEM Copy (MB/s) |
7,334 |
15,039 |
| Everest Ultimate MEM Latency (ns) |
66.4 |
38.7 |
| WinRAR 3.80 (min:sec) |
14:48 |
10:52 |
| POV-Ray 3.7 (min:sec) |
9:08 |
8:18 |
| 3DMark06 overall |
12,583 |
12,407 |
| 3DMark06 CPU |
4,276 |
4,620 |
| 3DMark Vantage |
7,459 |
7,450 |
| 3DMark Vantage CPU |
30,615 |
34,909 |
| 3DMark Vantage GPU |
6,034 |
5,902 |
| FEAR (FPS) |
114 |
132 |
| Quake 4 (FPS) |
180.3 |
144.6 |
| Valve Particle Test (FPS) |
100 |
131 |
| World In Conflict (FPS) |
188 |
151 |
NOTES: How we tested. We used matched GeForce 8800GTX cards for both platforms, matched Western Digital 150GB Raptors, Windows Vista Home Premium 64-bit and the same graphics drivers. The Core 2 Quad had 4GB of DDR3/1333 and the Core i7 had 3GB of DDR3/1066.
Core i7 Features Dissected
The Core i7 CPU sports some unique features—we test their merits
Hyperthreading: The Next Generation
Hyper-Threading got a bad rap under Pentium 4 for being more a hindrance than a help to performance. Our tests then showed that HT generally helped, but the lack of threaded applications made the feature pretty near worthless. Intel has reintroduced Hyper-Threading with the Core i7 and says it’s worth another look. We ran a handful of our multithreaded applications with HT both on and off and determined that this time around, it’s good stuff. We generally saw a healthy double-digit boost in performance with HT enabled. Using the latest version of ProShow Producer, we actually took a 26 percent hit by turning off Hyper-Threading. MainConcept’s encoder experienced a drop of 17 percent without Hyper-Threading. So, if you ask us, you oughta leave it on.
Benchmarks
| HyperThreading |
HT On |
HT Off |
| Main Concept |
15:58 |
19:13 |
| ProShow Producer 3.5 |
10:42 |
14:28 |
| Cinebench 10 32-bit |
15398 |
13451 |
| Cinebench 64-bit |
18963 |
16613 |
| PO V-Ray |
6:48 |
6:56 |
| 3DMark Vantage CPU |
39725 |
35623 |
NOTES: Best Scores in Bold
Tinkering with Turbo Mode
Intel’s Turbo Mode gives the user fine-grain control over individual cores. By shutting down individual cores that aren’t used during, say, a single-threaded game, you can pick up what is essentially free performance by overclocking, or rather, Turboing, from 3.2GHz to 3.8GHz. We dialed up the allowable, um, Turbos from the stock 24 to 27 to see if the feature works. Indeed it does. In our mostly single-threaded Photoshop CS3 test and World in Conflict, we saw the scaling you’d expect from a 10 percent overclock. Since we didn’t choose to overclock for two threads, we didn’t see much of a change in Quake 4. Our verdict is that it’s a worthwhile proposition, the caveat being that you will need liquid cooling or a big, fat heatsink to truly exploit its potential.
Benchmarks
| Turbo Mode |
Off |
On |
| Photoshop CS3 |
1:50 |
1:42 |
| Quake 4 |
228 FPS |
228 FPS |
| World in Conflict |
250 FPS |
272 FPS |
NOTES: Best Scores in Bold
Tri-Channel Memory Tested
Core i7’s tri-channel DDR3 memory controller presents a radical alternative to the standard dual-channel configurations. Since the controller lets you run single, dual, or tri mode, we decided to take a look at the actual bandwidth offered by each scenario and the resulting real-world impact. Using three Qimonda 1GB DDR3/1066 DIMMs and a single Corsair 2GB DDR3/1600 DIMM (set at DDR3/1066), we ran two RAM benchmarks and Quake 4. The upshot is that for the best performance, you should populate three channels.
Benchmarks
| Tri-Channel |
3 DIMM 3GB DDR3 |
2 DIMM 2GB DDR3 |
1 DIMM 2GB DDR3 |
1 DIMM 1GB DDR3 |
| SiSoft Sandra RAM Bandwidth |
18.15 |
12.7 |
7.1 |
6.75 |
| Everest Ultimate MEM Read |
15167 |
14388 |
8317 |
8236 |
| Everest Ultimate MEM Write |
12041 |
13590 |
8285 |
8187 |
| Everest Ultimate MEM Copy |
15583 |
14848 |
9062 |
7798 |
| Quake 4 |
228.0 |
172.4 |
213 |
167 |