[G2 and Desire Z General] sundar2012:
I suggest you read the pages you link to before you tell me that I am wrong:

-------------------------------------------------------------

Second-Generation

MSM8x55™ Chipsets

The MSM8x55 chipset platform consists of the MSM8255™ and MSM8655™ and features a newly designed and optimized multimedia sub-system over previous Snapdragon generations.

Scorpion 1 GHz CPU

Integrated 3G mobile broadband connectivity

MSM8255 support for HSPA+ networks – up to14 Mbps downloads and 5.76 Mbps uploads

MSM8655 support for HSPA+ networks – up to 14.4 Mbps downloads and 5.76 Mbps uploads – as well as CDMA2000 1X, 1xEV-DO Rel 0/A/B

Low-power 45nm process technology for higher integration and performance

High-definition (720p) video recording and playback up to 30 frames per second

Multiple video codecs: (MPEG-4, MPEG-2, H.264, H.263, VC-1, DivX, DivX 3.11, Sorenson Spark, On2 VP6)

High-performance GPU - up to 41M triangles/sec and 245M 3D pixels/se with dedicated 2D Open VG graphics hardware

High-resolution up to XGA (1024x768) display support

12-megapixel camera support

Built-in eighth-generation gps engine with Standalone-GPS and Assisted-GPS modes

Support for Wi-Fi® and Bluetooth® connectivity

Multiple audio codecs: (AAC+, eAAC+, AMR, FR, EFR, HR, WB-AMR, G.729a, G.711, AAC stereo encode)

Support for mobile broadcast TV (MediaFLO™, DVB-H and ISDB-T)

Support for Android™, Brew® Mobile Platform and Windows® Phone

MSM7x30™ Chipsets

The MSM7x30 chipset platform consists of the MSM7230™ and MSM7630™.

Scorpion 800 MHz CPU

Integrated 3G mobile broadband connectivity

MSM7230 support for HSPA+ networks - up to 14 Mbps downloads and 5.76 Mbps uploads

MSM7630 support for HSPA+ networks - up to 14.4 Mbps downloads and 15.761 Mbps uploads – as well as CDMA2000 1X, 1xEV-DO Rel A/B, GSM, GPRS and EDGE

Low-power 45nm process technology for higher integration and performance

High-definition (720p) video recording and playback up to 30 frames per second

Multiple video codecs: (MPEG-4, H.264, H.263, VC-1, DivX, DivX 3.11, Sorenson Spark, VP6)

High-performance GPU - up to 41M triangles/sec and 245M 3D pixels/sec and dedicated 3D/2D acceleration engines for Open GLES 2.0 and Open VG 1.1 acceleration

High-resolution XGA (1024x768) display support

12-megapixel camera support

Built-in eighth-generation gps engine with Standalone-GPS and Assisted-GPS modes

Support for Wi-Fi® and Bluetooth® connectivity

Multiple audio codecs: (AAC+, eAAC+, AMR, FR, EFR, HR, WB-AMR, G.729a, G.711, AAC stereo encode)

Support for mobile broadcast TV (MediaFLO™, DVB-H and ISDB-T)

Support for Android™, Brew® Mobile Platform and Windows® Phone

-------------------------------------------------------------

The Desire HD/MyTouch 4g - High-performance GPU - up to 41M triangles/sec and 245M 3D pixels/se with dedicated 2D Open VG graphics hardware

The Desire Z/G2 - High-performance GPU - up to 41M triangles/sec and 245M 3D pixels/sec and dedicated 3D/2D acceleration engines for Open GLES 2.0 and Open VG 1.1 acceleration

notice the increased capabilities of the G2 when it comes to 3d games, particularly Open GL. The tradeoff is that the G2 doesnt support as many video codecs:

The Desire HD/MyTouch 4g - (MPEG-4, MPEG-2, H.264, H.263, VC-1, DivX, DivX 3.11, Sorenson Spark, On2 VP6)

The Desire Z/G2 - (MPEG-4, H.264, H.263, VC-1, DivX, DivX 3.11, Sorenson Spark, VP6)