http://pc.watch.impress.co.jp/docs/news/20090914_315467.html
Intel、9月22日~24日に開催予定のIDFの内容を予告
~32nm製品やJasper Forestなどの詳細が明らかに
Larrabee這回會講詳情嗎….
話說RV870也發表了關於對OpenCL支援的技術特性,其實也是進步不少,
比方說現在有支援global synchronization和share memory等等,其實也算over OpenCL的spec了。
ROP倍增也大幅地提昇了其吞吐能力,只要每個ROP都維持RV770時期的能力,
目前看來每個ROP應該都可以單週期完成1個8x AAed pixel。
(或者該說每個ROP的性能倍增?好像有看到32ROP的數字…)
Additional Functionality Beyond OpenCL1.0
§32-bit Atomic Operations
§Flexible 32 KB Local Data Shares
§64 KB Global Data Share
§Global Synchronization
§Append/Consume Buffers
總之不僅GT300在頭痛,對Larrabee而言可能RV870的威脅更大…..
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http://www.itmedia.co.jp/enterprise/articles/0909/14/news021.html
Oracleの対IBM「宣戦布告」広告の背景
memo。
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http://av.watch.impress.co.jp/docs/news/20090819_309355.html
オリンパス、8GB/音質改善の新リニアPCMレコーダ
-実売5万円の「LS-11」。新Voice-Trek DSシリーズも
http://av.watch.impress.co.jp/docs/series/dal/20090914_315537.html
第387回:オリンパスの新リニアPCMレコーダ「LS-11」
~ 高感度マイク/低域強化で音質向上。オーディオI/Fにも ~
LS-11看起來比LS-10還棒_A_)a
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http://bb.watch.impress.co.jp/docs/news/20090914_315492.html
IEEE、無線LAN規格「IEEE 802.11n」を正式承認
實在等很久了_A_
順道,整理一下提升到600Mbps的手法:
1. More subcarriers: 802.11g has 48 OFDM data subcarriers. 802.11n increases this number to 52, thereby boosting throughput from 54Mbps to 58.5 Mbps.
2. FEC: 802.11g has a maximum FEC (Forward Error Correction) coding rate of 3/4. 802.11n squeezes some redundancy out of this with a 5/6 coding rate, boosting the link rate from 58.5 Mbps to 65 Mbps.
3. Guard Interval: 802.11a has Guard Interval between transmissions of 800ns. 802.11n has an option to reduce this to 400ns, which boosts the throughput from 65 Mbps to 72.2 Mbps.
4. MIMO: thanks to the magical effect of spatial multiplexing, provided there are sufficient multi-path reflections, the throughput of a system goes up linearly with each extra antenna at both ends. Two antennas at each end double the throughput, three antennas at each end triple it, and four quadruple it. The maximum number of antennas in the receive and transmit arrays specified by 802.11n is four. This allows four simultaneous 72.2 Mbps streams, yielding a total throughput of 288.9 Mbps.
5. 40 MHz channels: all previous versions of 802.11 have a channel bandwidth of 20MHz. 802.11n has an optional mode (controversial and not usable in many circumstances) where the channel bandwidth is 40 MHz. While the channel bandwidth is doubled, the number of data subcarriers is slightly more than doubled, going from 52 to 108. This yields a total channel throughput of 150 Mbps. So again combining four channels with MIMO, we get 600 Mbps.